generic.c

linux-2.6.15.6

	return 0;
}
EXPORT_SYMBOL(agp_unbind_memory);

/* End - Routines for handling swapping of agp_memory into the GATT */


/* Generic Agp routines - Start */
static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
{
	u32 tmp;

	if (*requested_mode & AGP2_RESERVED_MASK) {
		printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
			*requested_mode & AGP2_RESERVED_MASK, *requested_mode);
		*requested_mode &= ~AGP2_RESERVED_MASK;
	}

	/* Check the speed bits make sense. Only one should be set. */
	tmp = *requested_mode & 7;
	switch (tmp) {
		case 0:
			printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
			*requested_mode |= AGPSTAT2_1X;
			break;
		case 1:
		case 2:
			break;
		case 3:
			*requested_mode &= ~(AGPSTAT2_1X);	/* rate=2 */
			break;
		case 4:
			break;
		case 5:
		case 6:
		case 7:
			*requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
			break;
	}

	/* disable SBA if it's not supported */
	if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
		*bridge_agpstat &= ~AGPSTAT_SBA;

	/* Set rate */
	if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
		*bridge_agpstat &= ~AGPSTAT2_4X;

	if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
		*bridge_agpstat &= ~AGPSTAT2_2X;

	if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
		*bridge_agpstat &= ~AGPSTAT2_1X;

	/* Now we know what mode it should be, clear out the unwanted bits. */
	if (*bridge_agpstat & AGPSTAT2_4X)
		*bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X);	/* 4X */

	if (*bridge_agpstat & AGPSTAT2_2X)
		*bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X);	/* 2X */

	if (*bridge_agpstat & AGPSTAT2_1X)
		*bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);	/* 1X */

	/* Apply any errata. */
	if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
		*bridge_agpstat &= ~AGPSTAT_FW;

	if (agp_bridge->flags & AGP_ERRATA_SBA)
		*bridge_agpstat &= ~AGPSTAT_SBA;

	if (agp_bridge->flags & AGP_ERRATA_1X) {
		*bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
		*bridge_agpstat |= AGPSTAT2_1X;
	}

	/* If we've dropped down to 1X, disable fast writes. */
	if (*bridge_agpstat & AGPSTAT2_1X)
		*bridge_agpstat &= ~AGPSTAT_FW;
}

/*
 * requested_mode = Mode requested by (typically) X.
 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
 * vga_agpstat = PCI_AGP_STATUS from graphic card.
 */
static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
{
	u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
	u32 tmp;

	if (*requested_mode & AGP3_RESERVED_MASK) {
		printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
			*requested_mode & AGP3_RESERVED_MASK, *requested_mode);
		*requested_mode &= ~AGP3_RESERVED_MASK;
	}

	/* Check the speed bits make sense. */
	tmp = *requested_mode & 7;
	if (tmp == 0) {
		printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
		*requested_mode |= AGPSTAT3_4X;
	}
	if (tmp >= 3) {
		printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
		*requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
	}

	/* ARQSZ - Set the value to the maximum one.
	 * Don't allow the mode register to override values. */
	*bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
		max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));

	/* Calibration cycle.
	 * Don't allow the mode register to override values. */
	*bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
		min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));

	/* SBA *must* be supported for AGP v3 */
	*bridge_agpstat |= AGPSTAT_SBA;

	/*
	 * Set speed.
	 * Check for invalid speeds. This can happen when applications
	 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
	 */
	if (*requested_mode & AGPSTAT_MODE_3_0) {
		/*
		 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
		 * have been passed a 3.0 mode, but with 2.x speed bits set.
		 * AGP2.x 4x -> AGP3.0 4x.
		 */
		if (*requested_mode & AGPSTAT2_4X) {
			printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
						current->comm, *requested_mode);
			*requested_mode &= ~AGPSTAT2_4X;
			*requested_mode |= AGPSTAT3_4X;
		}
	} else {
		/*
		 * The caller doesn't know what they are doing. We are in 3.0 mode,
		 * but have been passed an AGP 2.x mode.
		 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
		 */
		printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
					current->comm, *requested_mode);
		*requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
		*requested_mode |= AGPSTAT3_4X;
	}

	if (*requested_mode & AGPSTAT3_8X) {
		if (!(*bridge_agpstat & AGPSTAT3_8X)) {
			*bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
			*bridge_agpstat |= AGPSTAT3_4X;
			printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
			return;
		}
		if (!(*vga_agpstat & AGPSTAT3_8X)) {
			*bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
			*bridge_agpstat |= AGPSTAT3_4X;
			printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
			return;
		}
		/* All set, bridge & device can do AGP x8*/
		*bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
		goto done;

	} else {

		/*
		 * If we didn't specify AGPx8, we can only do x4.
		 * If the hardware can't do x4, we're up shit creek, and never
		 *  should have got this far.
		 */
		*bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
		if ((*bridge_agpstat & AGPSTAT3_4X) && (*vga_agpstat & AGPSTAT3_4X))
			*bridge_agpstat |= AGPSTAT3_4X;
		else {
			printk(KERN_INFO PFX "Badness. Don't know which AGP mode to set. "
							"[bridge_agpstat:%x vga_agpstat:%x fell back to:- bridge_agpstat:%x vga_agpstat:%x]\n",
							origbridge, origvga, *bridge_agpstat, *vga_agpstat);
			if (!(*bridge_agpstat & AGPSTAT3_4X))
				printk(KERN_INFO PFX "Bridge couldn't do AGP x4.\n");
			if (!(*vga_agpstat & AGPSTAT3_4X))
				printk(KERN_INFO PFX "Graphic card couldn't do AGP x4.\n");
			return;
		}
	}

done:
	/* Apply any errata. */
	if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
		*bridge_agpstat &= ~AGPSTAT_FW;

	if (agp_bridge->flags & AGP_ERRATA_SBA)
		*bridge_agpstat &= ~AGPSTAT_SBA;

	if (agp_bridge->flags & AGP_ERRATA_1X) {
		*bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
		*bridge_agpstat |= AGPSTAT2_1X;
	}
}


/**
 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
 * @requested_mode: requested agp_stat from userspace (Typically from X)
 * @bridge_agpstat: current agp_stat from AGP bridge.
 *
 * This function will hunt for an AGP graphics card, and try to match
 * the requested mode to the capabilities of both the bridge and the card.
 */
u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
{
	struct pci_dev *device = NULL;
	u32 vga_agpstat;
	u8 cap_ptr;

	for (;;) {
		device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
		if (!device) {
			printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
			return 0;
		}
		cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
		if (cap_ptr)
			break;
	}

	/*
	 * Ok, here we have a AGP device. Disable impossible
	 * settings, and adjust the readqueue to the minimum.
	 */
	pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);

	/* adjust RQ depth */
	bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
	     min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
		 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));

	/* disable FW if it's not supported */
	if (!((bridge_agpstat & AGPSTAT_FW) &&
		 (vga_agpstat & AGPSTAT_FW) &&
		 (requested_mode & AGPSTAT_FW)))
		bridge_agpstat &= ~AGPSTAT_FW;

	/* Check to see if we are operating in 3.0 mode */
	if (agp_bridge->mode & AGPSTAT_MODE_3_0)
		agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
	else
		agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);

	pci_dev_put(device);
	return bridge_agpstat;
}
EXPORT_SYMBOL(agp_collect_device_status);


void agp_device_command(u32 bridge_agpstat, int agp_v3)
{
	struct pci_dev *device = NULL;
	int mode;

	mode = bridge_agpstat & 0x7;
	if (agp_v3)
		mode *= 4;

	for_each_pci_dev(device) {
		u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
		if (!agp)
			continue;

		printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
				agp_v3 ? 3 : 2, pci_name(device), mode);
		pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
	}
}
EXPORT_SYMBOL(agp_device_command);


void get_agp_version(struct agp_bridge_data *bridge)
{
	u32 ncapid;

	/* Exit early if already set by errata workarounds. */
	if (bridge->major_version != 0)
		return;

	pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
	bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
	bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
}
EXPORT_SYMBOL(get_agp_version);


void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
{
	u32 bridge_agpstat, temp;

	get_agp_version(agp_bridge);

	printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
				agp_bridge->major_version,
				agp_bridge->minor_version,
				pci_name(agp_bridge->dev));

	pci_read_config_dword(agp_bridge->dev,
		      agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);

	bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
	if (bridge_agpstat == 0)
		/* Something bad happened. FIXME: Return error code? */
		return;

	bridge_agpstat |= AGPSTAT_AGP_ENABLE;

	/* Do AGP version specific frobbing. */
	if (bridge->major_version >= 3) {
		if (bridge->mode & AGPSTAT_MODE_3_0) {
			/* If we have 3.5, we can do the isoch stuff. */
			if (bridge->minor_version >= 5)
				agp_3_5_enable(bridge);
			agp_device_command(bridge_agpstat, TRUE);
			return;
		} else {
		    /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
		    bridge_agpstat &= ~(7<<10) ;
		    pci_read_config_dword(bridge->dev,
					bridge->capndx+AGPCTRL, &temp);
		    temp |= (1<<9);
		    pci_write_config_dword(bridge->dev,
					bridge->capndx+AGPCTRL, temp);

		    printk(KERN_INFO PFX "Device is in legacy mode,"
				" falling back to 2.x\n");
		}
	}

	/* AGP v<3 */
	agp_device_command(bridge_agpstat, FALSE);
}
EXPORT_SYMBOL(agp_generic_enable);


int agp_generic_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;

	/* The generic routines 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;

	if (bridge->driver->size_type != FIXED_APER_SIZE) {
		do {
			switch (bridge->driver->size_type) {
			case U8_APER_SIZE:
				size = A_SIZE_8(temp)->size;
				page_order =
				    A_SIZE_8(temp)->page_order;
				num_entries =
				    A_SIZE_8(temp)->num_entries;
				break;
			case U16_APER_SIZE:
				size = A_SIZE_16(temp)->size;
				page_order = A_SIZE_16(temp)->page_order;
				num_entries = A_SIZE_16(temp)->num_entries;
				break;
			case U32_APER_SIZE:
				size = A_SIZE_32(temp)->size;
				page_order = A_SIZE_32(temp)->page_order;
				num_entries = A_SIZE_32(temp)->num_entries;
				break;
				/* This case will never really happen. */
			case FIXED_APER_SIZE:
			case LVL2_APER_SIZE:
			default:
				size = page_order = num_entries = 0;
				break;
			}

			table = alloc_gatt_pages(page_order);

			if (table == NULL) {
				i++;
				switch (bridge->driver->size_type) {
				case U8_APER_SIZE:
					bridge->current_size = A_IDX8(bridge);
					break;
				case U16_APER_SIZE:
					bridge->current_size = A_IDX16(bridge);
					break;