uninorth-agp.c

linux-2.6.15.6

static int agp_uninorth_resume(struct pci_dev *pdev)
{
	struct agp_bridge_data *bridge;
	u32 command;

	bridge = agp_find_bridge(pdev);
	if (bridge == NULL)
		return -ENODEV;

	command = (u32)bridge->dev_private_data;
	bridge->dev_private_data = NULL;
	if (!(command & PCI_AGP_COMMAND_AGP))
		return 0;

	uninorth_agp_enable(bridge, command);

	return 0;
}
#endif /* CONFIG_PM */

static int uninorth_create_gatt_table(struct agp_bridge_data *bridge)
{
	char *table;
	char *table_end;
	int size;
	int page_order;
	int num_entries;
	int i;
	void *temp;
	struct page *page;

	/* We can't handle 2 level gatt's */
	if (bridge->driver->size_type == LVL2_APER_SIZE)
		return -EINVAL;

	table = NULL;
	i = bridge->aperture_size_idx;
	temp = bridge->current_size;
	size = page_order = num_entries = 0;

	do {
		size = A_SIZE_32(temp)->size;
		page_order = A_SIZE_32(temp)->page_order;
		num_entries = A_SIZE_32(temp)->num_entries;

		table = (char *) __get_free_pages(GFP_KERNEL, page_order);

		if (table == NULL) {
			i++;
			bridge->current_size = A_IDX32(bridge);
		} else {
			bridge->aperture_size_idx = i;
		}
	} while (!table && (i < bridge->driver->num_aperture_sizes));

	if (table == NULL)
		return -ENOMEM;

	table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);

	for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
		SetPageReserved(page);

	bridge->gatt_table_real = (u32 *) table;
	bridge->gatt_table = (u32 *)table;
	bridge->gatt_bus_addr = virt_to_gart(table);

	for (i = 0; i < num_entries; i++)
		bridge->gatt_table[i] = 0;

	flush_dcache_range((unsigned long)table, (unsigned long)table_end);

	return 0;
}

static int uninorth_free_gatt_table(struct agp_bridge_data *bridge)
{
	int page_order;
	char *table, *table_end;
	void *temp;
	struct page *page;

	temp = bridge->current_size;
	page_order = A_SIZE_32(temp)->page_order;

	/* Do not worry about freeing memory, because if this is
	 * called, then all agp memory is deallocated and removed
	 * from the table.
	 */

	table = (char *) bridge->gatt_table_real;
	table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);

	for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
		ClearPageReserved(page);

	free_pages((unsigned long) bridge->gatt_table_real, page_order);

	return 0;
}

void null_cache_flush(void)
{
	mb();
}

/* Setup function */

static struct aper_size_info_32 uninorth_sizes[7] =
{
#if 0 /* Not sure uninorth supports that high aperture sizes */
	{256, 65536, 6, 64},
	{128, 32768, 5, 32},
	{64, 16384, 4, 16},
#endif	
	{32, 8192, 3, 8},
	{16, 4096, 2, 4},
	{8, 2048, 1, 2},
	{4, 1024, 0, 1}
};

/*
 * Not sure that u3 supports that high aperture sizes but it
 * would strange if it did not :)
 */
static struct aper_size_info_32 u3_sizes[8] =
{
	{512, 131072, 7, 128},
	{256, 65536, 6, 64},
	{128, 32768, 5, 32},
	{64, 16384, 4, 16},
	{32, 8192, 3, 8},
	{16, 4096, 2, 4},
	{8, 2048, 1, 2},
	{4, 1024, 0, 1}
};

struct agp_bridge_driver uninorth_agp_driver = {
	.owner			= THIS_MODULE,
	.aperture_sizes		= (void *)uninorth_sizes,
	.size_type		= U32_APER_SIZE,
	.num_aperture_sizes	= 4,
	.configure		= uninorth_configure,
	.fetch_size		= uninorth_fetch_size,
	.cleanup		= uninorth_cleanup,
	.tlb_flush		= uninorth_tlbflush,
	.mask_memory		= agp_generic_mask_memory,
	.masks			= NULL,
	.cache_flush		= null_cache_flush,
	.agp_enable		= uninorth_agp_enable,
	.create_gatt_table	= uninorth_create_gatt_table,
	.free_gatt_table	= uninorth_free_gatt_table,
	.insert_memory		= uninorth_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	= agp_generic_destroy_page,
	.cant_use_aperture	= 1,
};

struct agp_bridge_driver u3_agp_driver = {
	.owner			= THIS_MODULE,
	.aperture_sizes		= (void *)u3_sizes,
	.size_type		= U32_APER_SIZE,
	.num_aperture_sizes	= 8,
	.configure		= uninorth_configure,
	.fetch_size		= uninorth_fetch_size,
	.cleanup		= uninorth_cleanup,
	.tlb_flush		= uninorth_tlbflush,
	.mask_memory		= agp_generic_mask_memory,
	.masks			= NULL,
	.cache_flush		= null_cache_flush,
	.agp_enable		= uninorth_agp_enable,
	.create_gatt_table	= uninorth_create_gatt_table,
	.free_gatt_table	= uninorth_free_gatt_table,
	.insert_memory		= u3_insert_memory,
	.remove_memory		= u3_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,
	.cant_use_aperture	= 1,
	.needs_scratch_page	= 1,
};

static struct agp_device_ids uninorth_agp_device_ids[] __devinitdata = {
	{
		.device_id	= PCI_DEVICE_ID_APPLE_UNI_N_AGP,
		.chipset_name	= "UniNorth",
	},
	{
		.device_id	= PCI_DEVICE_ID_APPLE_UNI_N_AGP_P,
		.chipset_name	= "UniNorth/Pangea",
	},
	{
		.device_id	= PCI_DEVICE_ID_APPLE_UNI_N_AGP15,
		.chipset_name	= "UniNorth 1.5",
	},
	{
		.device_id	= PCI_DEVICE_ID_APPLE_UNI_N_AGP2,
		.chipset_name	= "UniNorth 2",
	},
	{
		.device_id	= PCI_DEVICE_ID_APPLE_U3_AGP,
		.chipset_name	= "U3",
	},
	{
		.device_id	= PCI_DEVICE_ID_APPLE_U3L_AGP,
		.chipset_name	= "U3L",
	},
	{
		.device_id	= PCI_DEVICE_ID_APPLE_U3H_AGP,
		.chipset_name	= "U3H",
	},
	{
		.device_id	= PCI_DEVICE_ID_APPLE_IPID2_AGP,
		.chipset_name	= "UniNorth/Intrepid2",
	},
};

static int __devinit agp_uninorth_probe(struct pci_dev *pdev,
					const struct pci_device_id *ent)
{
	struct agp_device_ids *devs = uninorth_agp_device_ids;
	struct agp_bridge_data *bridge;
	struct device_node *uninorth_node;
	u8 cap_ptr;
	int j;

	cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
	if (cap_ptr == 0)
		return -ENODEV;

	/* probe for known chipsets */
	for (j = 0; devs[j].chipset_name != NULL; ++j) {
		if (pdev->device == devs[j].device_id) {
			printk(KERN_INFO PFX "Detected Apple %s chipset\n",
			       devs[j].chipset_name);
			goto found;
		}
	}

	printk(KERN_ERR PFX "Unsupported Apple chipset (device id: %04x).\n",
		pdev->device);
	return -ENODEV;

 found:
	/* Set revision to 0 if we could not read it. */
	uninorth_rev = 0;
	is_u3 = 0;
	/* Locate core99 Uni-N */
	uninorth_node = of_find_node_by_name(NULL, "uni-n");
	/* Locate G5 u3 */
	if (uninorth_node == NULL) {
		is_u3 = 1;
		uninorth_node = of_find_node_by_name(NULL, "u3");
	}
	if (uninorth_node) {
		int *revprop = (int *)
			get_property(uninorth_node, "device-rev", NULL);
		if (revprop != NULL)
			uninorth_rev = *revprop & 0x3f;
		of_node_put(uninorth_node);
	}

#ifdef CONFIG_PM
	/* Inform platform of our suspend/resume caps */
	pmac_register_agp_pm(pdev, agp_uninorth_suspend, agp_uninorth_resume);
#endif

	/* Allocate & setup our driver */
	bridge = agp_alloc_bridge();
	if (!bridge)
		return -ENOMEM;

	if (is_u3)
		bridge->driver = &u3_agp_driver;
	else
		bridge->driver = &uninorth_agp_driver;

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

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

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

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

#ifdef CONFIG_PM
	/* Inform platform of our suspend/resume caps */
	pmac_register_agp_pm(pdev, NULL, NULL);
#endif

	agp_remove_bridge(bridge);
	agp_put_bridge(bridge);
}

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

MODULE_DEVICE_TABLE(pci, agp_uninorth_pci_table);

static struct pci_driver agp_uninorth_pci_driver = {
	.name		= "agpgart-uninorth",
	.id_table	= agp_uninorth_pci_table,
	.probe		= agp_uninorth_probe,
	.remove		= agp_uninorth_remove,
};

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

static void __exit agp_uninorth_cleanup(void)
{
	pci_unregister_driver(&agp_uninorth_pci_driver);
}

module_init(agp_uninorth_init);
module_exit(agp_uninorth_cleanup);

MODULE_AUTHOR("Ben Herrenschmidt & Paul Mackerras");
MODULE_LICENSE("GPL");