/* * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. * * and Arnd Bergmann, IBM Corp. * Merged from powerpc/kernel/of_platform.c and * sparc{,64}/kernel/of_device.c by Stephen Rothwell * * 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. * */ #include #include #include #include #include #include #include #include #include #include static int of_dev_node_match(struct device *dev, void *data) { return dev->of_node == data; } /** * of_find_device_by_node - Find the platform_device associated with a node * @np: Pointer to device tree node * * Returns platform_device pointer, or NULL if not found */ struct platform_device *of_find_device_by_node(struct device_node *np) { struct device *dev; dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match); return dev ? to_platform_device(dev) : NULL; } EXPORT_SYMBOL(of_find_device_by_node); static int platform_driver_probe_shim(struct platform_device *pdev) { struct platform_driver *pdrv; struct of_platform_driver *ofpdrv; const struct of_device_id *match; pdrv = container_of(pdev->dev.driver, struct platform_driver, driver); ofpdrv = container_of(pdrv, struct of_platform_driver, platform_driver); /* There is an unlikely chance that an of_platform driver might match * on a non-OF platform device. If so, then of_match_device() will * come up empty. Return -EINVAL in this case so other drivers get * the chance to bind. */ match = of_match_device(pdev->dev.driver->of_match_table, &pdev->dev); return match ? ofpdrv->probe(pdev, match) : -EINVAL; } static void platform_driver_shutdown_shim(struct platform_device *pdev) { struct platform_driver *pdrv; struct of_platform_driver *ofpdrv; pdrv = container_of(pdev->dev.driver, struct platform_driver, driver); ofpdrv = container_of(pdrv, struct of_platform_driver, platform_driver); ofpdrv->shutdown(pdev); } /** * of_register_platform_driver */ int of_register_platform_driver(struct of_platform_driver *drv) { char *of_name; /* setup of_platform_driver to platform_driver adaptors */ drv->platform_driver.driver = drv->driver; /* Prefix the driver name with 'of:' to avoid namespace collisions * and bogus matches. There are some drivers in the tree that * register both an of_platform_driver and a platform_driver with * the same name. This is a temporary measure until they are all * cleaned up --gcl July 29, 2010 */ of_name = kmalloc(strlen(drv->driver.name) + 5, GFP_KERNEL); if (!of_name) return -ENOMEM; sprintf(of_name, "of:%s", drv->driver.name); drv->platform_driver.driver.name = of_name; if (drv->probe) drv->platform_driver.probe = platform_driver_probe_shim; drv->platform_driver.remove = drv->remove; if (drv->shutdown) drv->platform_driver.shutdown = platform_driver_shutdown_shim; drv->platform_driver.suspend = drv->suspend; drv->platform_driver.resume = drv->resume; return platform_driver_register(&drv->platform_driver); } EXPORT_SYMBOL(of_register_platform_driver); void of_unregister_platform_driver(struct of_platform_driver *drv) { platform_driver_unregister(&drv->platform_driver); kfree(drv->platform_driver.driver.name); drv->platform_driver.driver.name = NULL; } EXPORT_SYMBOL(of_unregister_platform_driver); #if defined(CONFIG_PPC_DCR) #include #endif #if !defined(CONFIG_SPARC) /* * The following routines scan a subtree and registers a device for * each applicable node. * * Note: sparc doesn't use these routines because it has a different * mechanism for creating devices from device tree nodes. */ /** * of_device_make_bus_id - Use the device node data to assign a unique name * @dev: pointer to device structure that is linked to a device tree node * * This routine will first try using either the dcr-reg or the reg property * value to derive a unique name. As a last resort it will use the node * name followed by a unique number. */ void of_device_make_bus_id(struct device *dev) { static atomic_t bus_no_reg_magic; struct device_node *node = dev->of_node; const u32 *reg; u64 addr; int magic; #ifdef CONFIG_PPC_DCR /* * If it's a DCR based device, use 'd' for native DCRs * and 'D' for MMIO DCRs. */ reg = of_get_property(node, "dcr-reg", NULL); if (reg) { #ifdef CONFIG_PPC_DCR_NATIVE dev_set_name(dev, "d%x.%s", *reg, node->name); #else /* CONFIG_PPC_DCR_NATIVE */ u64 addr = of_translate_dcr_address(node, *reg, NULL); if (addr != OF_BAD_ADDR) { dev_set_name(dev, "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) { dev_set_name(dev, "%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); dev_set_name(dev, "%s.%d", node->name, magic - 1); } /** * of_device_alloc - Allocate and initialize an of_device * @np: device node to assign to device * @bus_id: Name to assign to the device. May be null to use default name. * @parent: Parent device. */ struct platform_device *of_device_alloc(struct device_node *np, const char *bus_id, struct device *parent) { struct platform_device *dev; int rc, i, num_reg = 0, num_irq; struct resource *res, temp_res; dev = platform_device_alloc("", -1); if (!dev) return NULL; /* count the io and irq resources */ while (of_address_to_resource(np, num_reg, &temp_res) == 0) num_reg++; num_irq = of_irq_count(np); /* Populate the resource table */ if (num_irq || num_reg) { res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL); if (!res) { platform_device_put(dev); return NULL; } dev->num_resources = num_reg + num_irq; dev->resource = res; for (i = 0; i < num_reg; i++, res++) { rc = of_address_to_resource(np, i, res); WARN_ON(rc); } WARN_ON(of_irq_to_resource_table(np, res, num_irq) != num_irq); } dev->dev.of_node = of_node_get(np); #if defined(CONFIG_PPC) || defined(CONFIG_MICROBLAZE) dev->dev.dma_mask = &dev->archdata.dma_mask; #endif dev->dev.parent = parent; if (bus_id) dev_set_name(&dev->dev, "%s", bus_id); else of_device_make_bus_id(&dev->dev); return dev; } EXPORT_SYMBOL(of_device_alloc); /** * of_platform_device_create - Alloc, initialize and register an of_device * @np: pointer to node to create device for * @bus_id: name to assign device * @parent: Linux device model parent device. * * Returns pointer to created platform device, or NULL if a device was not * registered. Unavailable devices will not get registered. */ struct platform_device *of_platform_device_create(struct device_node *np, const char *bus_id, struct device *parent) { struct platform_device *dev; if (!of_device_is_available(np)) return NULL; dev = of_device_alloc(np, bus_id, parent); if (!dev) return NULL; #if defined(CONFIG_PPC) || defined(CONFIG_MICROBLAZE) dev->archdata.dma_mask = 0xffffffffUL; #endif dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); dev->dev.bus = &platform_bus_type; /* 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 (of_device_add(dev) != 0) { platform_device_put(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 instantiate matching busses. * @bus: device node of the bus to instantiate * @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(const struct device_node *bus, const struct of_device_id *matches, struct device *parent) { struct device_node *child; struct platform_device *dev; int rc = 0; for_each_child_of_node(bus, child) { pr_debug(" create child: %s\n", child->full_name); dev = of_platform_device_create(child, NULL, parent); if (dev == NULL) continue; 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 instantiated as devices * unless the specified root itself matches the bus list and is not NULL. */ int of_platform_bus_probe(struct device_node *root, const struct of_device_id *matches, struct device *parent) { struct device_node *child; struct platform_device *dev; int rc = 0; if (WARN_ON(!matches || matches == OF_NO_DEEP_PROBE)) return -EINVAL; if (root == NULL) root = of_find_node_by_path("/"); else of_node_get(root); if (root == NULL) return -EINVAL; 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) goto bail; pr_debug(" create all sub busses\n"); rc = of_platform_bus_create(root, matches, &dev->dev); goto bail; } for_each_child_of_node(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) continue; 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); #endif /* !CONFIG_SPARC */