/* *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. *			 <benh@kernel.crashing.org> *    and		 Arnd Bergmann, IBM Corp. * *  This program is free software; you can redistribute it and/or *  modify it under the terms of the GNU General Public License *  as published by the Free Software Foundation; either version *  2 of the License, or (at your option) any later version. * */ #undef DEBUG #include <linux/string.h>#include <linux/kernel.h>#include <linux/init.h>#include <linux/module.h>#include <linux/mod_devicetable.h>#include <linux/slab.h>#include <linux/pci.h> #include <asm/errno.h>#include <asm/dcr.h>#include <asm/of_device.h>#include <asm/of_platform.h>#include <asm/topology.h>#include <asm/pci-bridge.h>#include <asm/ppc-pci.h>#include <asm/atomic.h>  /* * The list of OF IDs below is used for matching bus types in the * system whose devices are to be exposed as of_platform_devices. * * This is the default list valid for most platforms. This file provides * functions who can take an explicit list if necessary though * * The search is always performed recursively looking for children of * the provided device_node and recursively if such a children matches * a bus type in the list */ static struct of_device_id of_default_bus_ids[] = {	{ .type = "soc", },	{ .compatible = "soc", },	{ .type = "spider", },	{ .type = "axon", },	{ .type = "plb5", },	{ .type = "plb4", },	{ .type = "opb", },	{ .type = "ebc", },	{},}; static atomic_t bus_no_reg_magic; /* * * OF platform device type definition & base infrastructure * */ static int of_platform_bus_match(struct device *dev, struct device_driver *drv){	struct of_device * of_dev = to_of_device(dev);	struct of_platform_driver * of_drv = to_of_platform_driver(drv);	const struct of_device_id * matches = of_drv->match_table; 	if (!matches)		return 0; 	return of_match_device(matches, of_dev) != NULL;} static int of_platform_device_probe(struct device *dev){	int error = -ENODEV;	struct of_platform_driver *drv;	struct of_device *of_dev;	const struct of_device_id *match; 	drv = to_of_platform_driver(dev->driver);	of_dev = to_of_device(dev); 	if (!drv->probe)		return error; 	of_dev_get(of_dev); 	match = of_match_device(drv->match_table, of_dev);	if (match)		error = drv->probe(of_dev, match);	if (error)		of_dev_put(of_dev); 	return error;} static int of_platform_device_remove(struct device *dev){	struct of_device * of_dev = to_of_device(dev);	struct of_platform_driver * drv = to_of_platform_driver(dev->driver); 	if (dev->driver && drv->remove)		drv->remove(of_dev);	return 0;} static int of_platform_device_suspend(struct device *dev, pm_message_t state){	struct of_device * of_dev = to_of_device(dev);	struct of_platform_driver * drv = to_of_platform_driver(dev->driver);	int error = 0; 	if (dev->driver && drv->suspend)		error = drv->suspend(of_dev, state);	return error;} static int of_platform_device_resume(struct device * dev){	struct of_device * of_dev = to_of_device(dev);	struct of_platform_driver * drv = to_of_platform_driver(dev->driver);	int error = 0; 	if (dev->driver && drv->resume)		error = drv->resume(of_dev);	return error;} struct bus_type of_platform_bus_type = {       .name	= "of_platform",       .match	= of_platform_bus_match,       .probe	= of_platform_device_probe,       .remove	= of_platform_device_remove,       .suspend	= of_platform_device_suspend,       .resume	= of_platform_device_resume,};EXPORT_SYMBOL(of_platform_bus_type); static int __init of_bus_driver_init(void){	return bus_register(&of_platform_bus_type);} postcore_initcall(of_bus_driver_init); int of_register_platform_driver(struct of_platform_driver *drv){	/* initialize common driver fields */	drv->driver.name = drv->name;	drv->driver.bus = &of_platform_bus_type; 	/* register with core */	return driver_register(&drv->driver);}EXPORT_SYMBOL(of_register_platform_driver); void of_unregister_platform_driver(struct of_platform_driver *drv){	driver_unregister(&drv->driver);}EXPORT_SYMBOL(of_unregister_platform_driver); static void of_platform_make_bus_id(struct of_device *dev){	struct device_node *node = dev->node;	char *name = dev->dev.bus_id;	const u32 *reg;	u64 addr;	int magic; 	/*	 * If it's a DCR based device, use 'd' for native DCRs	 * and 'D' for MMIO DCRs.	 */#ifdef CONFIG_PPC_DCR	reg = get_property(node, "dcr-reg", NULL);	if (reg) {#ifdef CONFIG_PPC_DCR_NATIVE		snprintf(name, BUS_ID_SIZE, "d%x.%s",			 *reg, node->name);#else /* CONFIG_PPC_DCR_NATIVE */		addr = of_translate_dcr_address(node, *reg, NULL);		if (addr != OF_BAD_ADDR) {			snprintf(name, BUS_ID_SIZE,				 "D%llx.%s", (unsigned long long)addr,				 node->name);			return;		}#endif /* !CONFIG_PPC_DCR_NATIVE */	}#endif /* CONFIG_PPC_DCR */ 	/*	 * For MMIO, get the physical address	 */	reg = get_property(node, "reg", NULL);	if (reg) {		addr = of_translate_address(node, reg);		if (addr != OF_BAD_ADDR) {			snprintf(name, BUS_ID_SIZE,				 "%llx.%s", (unsigned long long)addr,				 node->name);			return;		}	} 	/*	 * No BusID, use the node name and add a globally incremented	 * counter (and pray...)	 */	magic = atomic_add_return(1, &bus_no_reg_magic);	snprintf(name, BUS_ID_SIZE, "%s.%d", node->name, magic - 1);} struct of_device* of_platform_device_create(struct device_node *np,					    const char *bus_id,					    struct device *parent){	struct of_device *dev; 	dev = kmalloc(sizeof(*dev), GFP_KERNEL);	if (!dev)		return NULL;	memset(dev, 0, sizeof(*dev)); 	dev->node = of_node_get(np);	dev->dma_mask = 0xffffffffUL;	dev->dev.dma_mask = &dev->dma_mask;	dev->dev.parent = parent;	dev->dev.bus = &of_platform_bus_type;	dev->dev.release = of_release_dev;	dev->dev.archdata.of_node = np;	dev->dev.archdata.numa_node = of_node_to_nid(np); 	/* We do not fill the DMA ops for platform devices by default.	 * This is currently the responsibility of the platform code	 * to do such, possibly using a device notifier	 */ 	if (bus_id)		strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);	else		of_platform_make_bus_id(dev); 	if (of_device_register(dev) != 0) {		kfree(dev);		return NULL;	} 	return dev;}EXPORT_SYMBOL(of_platform_device_create);   /** * of_platform_bus_create - Create an OF device for a bus node and all its * children. Optionally recursively instanciate matching busses. * @bus: device node of the bus to instanciate * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to * disallow recursive creation of child busses */static int of_platform_bus_create(struct device_node *bus,				  struct of_device_id *matches,				  struct device *parent){	struct device_node *child;	struct of_device *dev;	int rc = 0; 	for (child = NULL; (child = of_get_next_child(bus, child)); ) {		pr_debug("   create child: %s\n", child->full_name);		dev = of_platform_device_create(child, NULL, parent);		if (dev == NULL)			rc = -ENOMEM;		else if (!of_match_node(matches, child))			continue;		if (rc == 0) {			pr_debug("   and sub busses\n");			rc = of_platform_bus_create(child, matches, &dev->dev);		} if (rc) {			of_node_put(child);			break;		}	}	return rc;} /** * of_platform_bus_probe - Probe the device-tree for platform busses * @root: parent of the first level to probe or NULL for the root of the tree * @matches: match table, NULL to use the default * @parent: parent to hook devices from, NULL for toplevel * * Note that children of the provided root are not instanciated as devices * unless the specified root itself matches the bus list and is not NULL. */ int of_platform_bus_probe(struct device_node *root,			  struct of_device_id *matches,			  struct device *parent){	struct device_node *child;	struct of_device *dev;	int rc = 0; 	if (matches == NULL)		matches = of_default_bus_ids;	if (matches == OF_NO_DEEP_PROBE)		return -EINVAL;	if (root == NULL)		root = of_find_node_by_path("/");	else		of_node_get(root); 	pr_debug("of_platform_bus_probe()\n");	pr_debug(" starting at: %s\n", root->full_name); 	/* Do a self check of bus type, if there's a match, create	 * children	 */	if (of_match_node(matches, root)) {		pr_debug(" root match, create all sub devices\n");		dev = of_platform_device_create(root, NULL, parent);		if (dev == NULL) {			rc = -ENOMEM;			goto bail;		}		pr_debug(" create all sub busses\n");		rc = of_platform_bus_create(root, matches, &dev->dev);		goto bail;	}	for (child = NULL; (child = of_get_next_child(root, child)); ) {		if (!of_match_node(matches, child))			continue; 		pr_debug("  match: %s\n", child->full_name);		dev = of_platform_device_create(child, NULL, parent);		if (dev == NULL)			rc = -ENOMEM;		else			rc = of_platform_bus_create(child, matches, &dev->dev);		if (rc) {			of_node_put(child);			break;		}	} bail:	of_node_put(root);	return rc;}EXPORT_SYMBOL(of_platform_bus_probe); static int of_dev_node_match(struct device *dev, void *data){	return to_of_device(dev)->node == data;} struct of_device *of_find_device_by_node(struct device_node *np){	struct device *dev; 	dev = bus_find_device(&of_platform_bus_type,			      NULL, np, of_dev_node_match);	if (dev)		return to_of_device(dev);	return NULL;}EXPORT_SYMBOL(of_find_device_by_node); static int of_dev_phandle_match(struct device *dev, void *data){	phandle *ph = data;	return to_of_device(dev)->node->linux_phandle == *ph;} struct of_device *of_find_device_by_phandle(phandle ph){	struct device *dev; 	dev = bus_find_device(&of_platform_bus_type,			      NULL, &ph, of_dev_phandle_match);	if (dev)		return to_of_device(dev);	return NULL;}EXPORT_SYMBOL(of_find_device_by_phandle);  #ifdef CONFIG_PPC_OF_PLATFORM_PCI /* The probing of PCI controllers from of_platform is currently * 64 bits only, mostly due to gratuitous differences between * the 32 and 64 bits PCI code on PowerPC and the 32 bits one * lacking some bits needed here. */ static int __devinit of_pci_phb_probe(struct of_device *dev,				      const struct of_device_id *match){	struct pci_controller *phb; 	/* Check if we can do that ... */	if (ppc_md.pci_setup_phb == NULL)		return -ENODEV; 	printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name); 	/* Alloc and setup PHB data structure */	phb = pcibios_alloc_controller(dev->node);	if (!phb)		return -ENODEV; 	/* Setup parent in sysfs */	phb->parent = &dev->dev; 	/* Setup the PHB using arch provided callback */	if (ppc_md.pci_setup_phb(phb)) {		pcibios_free_controller(phb);		return -ENODEV;	} 	/* Process "ranges" property */	pci_process_bridge_OF_ranges(phb, dev->node, 0); 	/* Setup IO space.	 * This will not work properly for ISA IOs, something needs to be done	 * about it if we ever generalize that way of probing PCI brigdes	 */	pci_setup_phb_io_dynamic(phb, 0); 	/* Init pci_dn data structures */	pci_devs_phb_init_dynamic(phb); 	/* Register devices with EEH */#ifdef CONFIG_EEH	if (dev->node->child)		eeh_add_device_tree_early(dev->node);#endif /* CONFIG_EEH */ 	/* Scan the bus */	scan_phb(phb); 	/* Claim resources. This might need some rework as well depending	 * wether we are doing probe-only or not, like assigning unassigned	 * resources etc...	 */	pcibios_claim_one_bus(phb->bus); 	/* Finish EEH setup */#ifdef CONFIG_EEH	eeh_add_device_tree_late(phb->bus);#endif 	/* Add probed PCI devices to the device model */	pci_bus_add_devices(phb->bus); 	return 0;} static struct of_device_id of_pci_phb_ids[] = {	{ .type = "pci", },	{ .type = "pcix", },	{ .type = "pcie", },	{ .type = "pciex", },	{ .type = "ht", },	{}}; static struct of_platform_driver of_pci_phb_driver = {       .name = "of-pci",       .match_table = of_pci_phb_ids,       .probe = of_pci_phb_probe,       .driver = {	       .multithread_probe = 1,       },}; static __init int of_pci_phb_init(void){	return of_register_platform_driver(&of_pci_phb_driver);} device_initcall(of_pci_phb_init); #endif /* CONFIG_PPC_OF_PLATFORM_PCI */