/* * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * 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, .uevent = of_device_uevent, .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 = of_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 = of_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. We use the non-dynamic version of that code here, * which doesn't quite support unplugging. Next kernel release will * have a better fix for this. * Note also that we don't do ISA, this will also be fixed with a * more massive rework. */ pci_setup_phb_io(phb, pci_io_base == 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, }; 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 */