| /* |
| * 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; |
| |
| struct bus_type of_platform_bus_type = { |
| .uevent = of_device_uevent, |
| }; |
| EXPORT_SYMBOL(of_platform_bus_type); |
| |
| static int __init of_bus_driver_init(void) |
| { |
| return of_bus_type_init(&of_platform_bus_type, "of_platform"); |
| } |
| |
| 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 = kzalloc(sizeof(*dev), GFP_KERNEL); |
| if (!dev) |
| return NULL; |
| |
| 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); |
| |
| /* 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 */ |