macio_asic.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 637 行 · 第 1/2 页

	return dev;
}

static int macio_skip_device(struct device_node *np)
{
	if (strncmp(np->name, "battery", 7) == 0)
		return 1;
	if (strncmp(np->name, "escc-legacy", 11) == 0)
		return 1;
	return 0;
}

/**
 * macio_pci_add_devices - Adds sub-devices of mac-io to the device tree
 * @chip: pointer to the macio_chip holding the devices
 * 
 * This function will do the job of extracting devices from the
 * Open Firmware device tree, build macio_dev structures and add
 * them to the Linux device tree.
 * 
 * For now, childs of media-bay are added now as well. This will
 * change rsn though.
 */
static void macio_pci_add_devices(struct macio_chip *chip)
{
	struct device_node *np, *pnode;
	struct macio_dev *rdev, *mdev, *mbdev = NULL, *sdev = NULL;
	struct device *parent = NULL;
	struct resource *root_res = &iomem_resource;
	
	/* Add a node for the macio bus itself */
#ifdef CONFIG_PCI
	if (chip->lbus.pdev) {
		parent = &chip->lbus.pdev->dev;
		root_res = &chip->lbus.pdev->resource[0];
	}
#endif
	pnode = of_node_get(chip->of_node);
	if (pnode == NULL)
		return;

	/* Add macio itself to hierarchy */
	rdev = macio_add_one_device(chip, parent, pnode, NULL, root_res);
	if (rdev == NULL)
		return;
	root_res = &rdev->resource[0];

	/* First scan 1st level */
	for (np = NULL; (np = of_get_next_child(pnode, np)) != NULL;) {
		if (!macio_skip_device(np)) {
			of_node_get(np);
			mdev = macio_add_one_device(chip, &rdev->ofdev.dev, np, NULL, root_res);
			if (mdev == NULL)
				of_node_put(np);
			else if (strncmp(np->name, "media-bay", 9) == 0)
				mbdev = mdev;
			else if (strncmp(np->name, "escc", 4) == 0)
				sdev = mdev;
		}
	}

	/* Add media bay devices if any */
	if (mbdev)
		for (np = NULL; (np = of_get_next_child(mbdev->ofdev.node, np)) != NULL;)
			if (!macio_skip_device(np)) {
				of_node_get(np);
				if (macio_add_one_device(chip, &mbdev->ofdev.dev, np, mbdev,
							 root_res) == NULL)
					of_node_put(np);
			}
	/* Add serial ports if any */
	if (sdev) {
		for (np = NULL; (np = of_get_next_child(sdev->ofdev.node, np)) != NULL;)
			if (!macio_skip_device(np)) {
				of_node_get(np);
				if (macio_add_one_device(chip, &sdev->ofdev.dev, np, NULL,
							 root_res) == NULL)
					of_node_put(np);
			}
	}
}


/**
 * macio_register_driver - Registers a new MacIO device driver
 * @drv: pointer to the driver definition structure
 */
int macio_register_driver(struct macio_driver *drv)
{
	int count = 0;

	/* initialize common driver fields */
	drv->driver.name = drv->name;
	drv->driver.bus = &macio_bus_type;
	drv->driver.probe = macio_device_probe;
	drv->driver.remove = macio_device_remove;
	drv->driver.shutdown = macio_device_shutdown;

	/* register with core */
	count = driver_register(&drv->driver);
	return count ? count : 1;
}

/**
 * macio_unregister_driver - Unregisters a new MacIO device driver
 * @drv: pointer to the driver definition structure
 */
void macio_unregister_driver(struct macio_driver *drv)
{
	driver_unregister(&drv->driver);
}

/**
 *	macio_request_resource - Request an MMIO resource
 * 	@dev: pointer to the device holding the resource
 *	@resource_no: resource number to request
 *	@name: resource name
 *
 *	Mark  memory region number @resource_no associated with MacIO
 *	device @dev as being reserved by owner @name.  Do not access
 *	any address inside the memory regions unless this call returns
 *	successfully.
 *
 *	Returns 0 on success, or %EBUSY on error.  A warning
 *	message is also printed on failure.
 */
int macio_request_resource(struct macio_dev *dev, int resource_no, const char *name)
{
	if (macio_resource_len(dev, resource_no) == 0)
		return 0;
		
	if (!request_mem_region(macio_resource_start(dev, resource_no),
				macio_resource_len(dev, resource_no),
				name))
		goto err_out;
	
	return 0;

err_out:
	printk (KERN_WARNING "MacIO: Unable to reserve resource #%d:%lx@%lx"
		" for device %s\n",
		resource_no,
		macio_resource_len(dev, resource_no),
		macio_resource_start(dev, resource_no),
		dev->ofdev.dev.bus_id);
	return -EBUSY;
}

/**
 * macio_release_resource - Release an MMIO resource
 * @dev: pointer to the device holding the resource
 * @resource_no: resource number to release
 */
void macio_release_resource(struct macio_dev *dev, int resource_no)
{
	if (macio_resource_len(dev, resource_no) == 0)
		return;
	release_mem_region(macio_resource_start(dev, resource_no),
			   macio_resource_len(dev, resource_no));
}

/**
 *	macio_request_resources - Reserve all memory resources
 *	@dev: MacIO device whose resources are to be reserved
 *	@name: Name to be associated with resource.
 *
 *	Mark all memory regions associated with MacIO device @dev as
 *	being reserved by owner @name.  Do not access any address inside
 *	the memory regions unless this call returns successfully.
 *
 *	Returns 0 on success, or %EBUSY on error.  A warning
 *	message is also printed on failure.
 */
int macio_request_resources(struct macio_dev *dev, const char *name)
{
	int i;
	
	for (i = 0; i < dev->n_resources; i++)
		if (macio_request_resource(dev, i, name))
			goto err_out;
	return 0;

err_out:
	while(--i >= 0)
		macio_release_resource(dev, i);
		
	return -EBUSY;
}

/**
 *	macio_release_resources - Release reserved memory resources
 *	@dev: MacIO device whose resources were previously reserved
 */

void macio_release_resources(struct macio_dev *dev)
{
	int i;
	
	for (i = 0; i < dev->n_resources; i++)
		macio_release_resource(dev, i);
}


#ifdef CONFIG_PCI

static int __devinit macio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	struct device_node* np;
	struct macio_chip* chip;
	
	if (ent->vendor != PCI_VENDOR_ID_APPLE)
		return -ENODEV;

	/* Note regarding refcounting: We assume pci_device_to_OF_node() is ported
	 * to new OF APIs and returns a node with refcount incremented. This isn't
	 * the case today, but on the other hand ppc32 doesn't do refcounting. This
	 * will have to be fixed when going to ppc64. --BenH.
	 */
	np = pci_device_to_OF_node(pdev);
	if (np == NULL)
		return -ENODEV;

	/* This assumption is wrong, fix that here for now until I fix the arch */
	of_node_get(np);

	/* We also assume that pmac_feature will have done a get() on nodes stored
	 * in the macio chips array
	 */
	chip = macio_find(np, macio_unknown);
       	of_node_put(np);
	if (chip == NULL)
		return -ENODEV;

	/* XXX Need locking ??? */
	if (chip->lbus.pdev == NULL) {
		chip->lbus.pdev = pdev;
		chip->lbus.chip = chip;
		pci_set_drvdata(pdev, &chip->lbus);
		pci_set_master(pdev);
	}

	printk(KERN_INFO "MacIO PCI driver attached to %s chipset\n",
		chip->name);

	/*
	 * HACK ALERT: The WallStreet PowerBook and some OHare based machines
	 * have 2 macio ASICs. I must probe the "main" one first or IDE ordering
	 * will be incorrect. So I put on "hold" the second one since it seem to
	 * appear first on PCI
	 */
	if (chip->type == macio_gatwick || chip->type == macio_ohareII)
		if (macio_chips[0].lbus.pdev == NULL) {
			macio_on_hold = chip;
			return 0;
		}

	macio_pci_add_devices(chip);
	if (macio_on_hold && macio_chips[0].lbus.pdev != NULL) {
		macio_pci_add_devices(macio_on_hold);
		macio_on_hold = NULL;
	}

	return 0;
}

static void __devexit macio_pci_remove(struct pci_dev* pdev)
{
	panic("removing of macio-asic not supported !\n");
}

/*
 * MacIO is matched against any Apple ID, it's probe() function
 * will then decide wether it applies or not
 */
static const struct pci_device_id __devinitdata pci_ids [] = { {
	.vendor		= PCI_VENDOR_ID_APPLE,
	.device		= PCI_ANY_ID,
	.subvendor	= PCI_ANY_ID,
	.subdevice	= PCI_ANY_ID,

	}, { /* end: all zeroes */ }
};
MODULE_DEVICE_TABLE (pci, pci_ids);

/* pci driver glue; this is a "new style" PCI driver module */
static struct pci_driver macio_pci_driver = {
	.name		= (char *) "macio",
	.id_table	= pci_ids,

	.probe		= macio_pci_probe,
	.remove		= macio_pci_remove,
};

#endif /* CONFIG_PCI */

static int __init macio_module_init (void) 
{
#ifdef CONFIG_PCI
	int rc;

	rc = pci_module_init(&macio_pci_driver);
	if (rc)
		return rc;
#endif /* CONFIG_PCI */
	return 0;
}

module_init(macio_module_init);

EXPORT_SYMBOL(macio_register_driver);
EXPORT_SYMBOL(macio_unregister_driver);
EXPORT_SYMBOL(macio_dev_get);
EXPORT_SYMBOL(macio_dev_put);
EXPORT_SYMBOL(macio_request_resource);
EXPORT_SYMBOL(macio_release_resource);
EXPORT_SYMBOL(macio_request_resources);
EXPORT_SYMBOL(macio_release_resources);