2009-03-27 21:25:12 +08:00
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/*
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* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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* and Arnd Bergmann, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#undef DEBUG
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/pci.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_platform.h>
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#include <linux/errno.h>
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#include <linux/topology.h>
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#include <asm/atomic.h>
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struct bus_type of_platform_bus_type = {
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.uevent = of_device_uevent,
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};
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EXPORT_SYMBOL(of_platform_bus_type);
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static int __init of_bus_driver_init(void)
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{
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return of_bus_type_init(&of_platform_bus_type, "of_platform");
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}
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postcore_initcall(of_bus_driver_init);
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struct of_device *of_platform_device_create(struct device_node *np,
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const char *bus_id,
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struct device *parent)
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{
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struct of_device *dev;
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dev = of_device_alloc(np, bus_id, parent);
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if (!dev)
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return NULL;
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dev->dma_mask = 0xffffffffUL;
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dev->dev.bus = &of_platform_bus_type;
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/* We do not fill the DMA ops for platform devices by default.
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* This is currently the responsibility of the platform code
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* to do such, possibly using a device notifier
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*/
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if (of_device_register(dev) != 0) {
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of_device_free(dev);
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return NULL;
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}
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return dev;
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}
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EXPORT_SYMBOL(of_platform_device_create);
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/**
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* of_platform_bus_create - Create an OF device for a bus node and all its
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* children. Optionally recursively instanciate matching busses.
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* @bus: device node of the bus to instanciate
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* @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
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* disallow recursive creation of child busses
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*/
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static int of_platform_bus_create(const struct device_node *bus,
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const struct of_device_id *matches,
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struct device *parent)
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{
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struct device_node *child;
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struct of_device *dev;
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int rc = 0;
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for_each_child_of_node(bus, child) {
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pr_debug(" create child: %s\n", child->full_name);
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dev = of_platform_device_create(child, NULL, parent);
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if (dev == NULL)
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rc = -ENOMEM;
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else if (!of_match_node(matches, child))
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continue;
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if (rc == 0) {
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pr_debug(" and sub busses\n");
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rc = of_platform_bus_create(child, matches, &dev->dev);
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}
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if (rc) {
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of_node_put(child);
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break;
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}
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}
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return rc;
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}
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/**
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* of_platform_bus_probe - Probe the device-tree for platform busses
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* @root: parent of the first level to probe or NULL for the root of the tree
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* @matches: match table, NULL to use the default
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* @parent: parent to hook devices from, NULL for toplevel
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*
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* Note that children of the provided root are not instanciated as devices
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* unless the specified root itself matches the bus list and is not NULL.
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*/
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int of_platform_bus_probe(struct device_node *root,
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const struct of_device_id *matches,
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struct device *parent)
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{
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struct device_node *child;
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struct of_device *dev;
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int rc = 0;
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if (matches == NULL)
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matches = of_default_bus_ids;
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if (matches == OF_NO_DEEP_PROBE)
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return -EINVAL;
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if (root == NULL)
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root = of_find_node_by_path("/");
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else
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of_node_get(root);
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pr_debug("of_platform_bus_probe()\n");
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pr_debug(" starting at: %s\n", root->full_name);
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/* Do a self check of bus type, if there's a match, create
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* children
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*/
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if (of_match_node(matches, root)) {
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pr_debug(" root match, create all sub devices\n");
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dev = of_platform_device_create(root, NULL, parent);
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if (dev == NULL) {
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rc = -ENOMEM;
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goto bail;
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}
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pr_debug(" create all sub busses\n");
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rc = of_platform_bus_create(root, matches, &dev->dev);
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goto bail;
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}
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for_each_child_of_node(root, child) {
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if (!of_match_node(matches, child))
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continue;
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pr_debug(" match: %s\n", child->full_name);
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dev = of_platform_device_create(child, NULL, parent);
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if (dev == NULL)
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rc = -ENOMEM;
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else
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rc = of_platform_bus_create(child, matches, &dev->dev);
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if (rc) {
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of_node_put(child);
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break;
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}
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}
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bail:
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of_node_put(root);
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return rc;
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}
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EXPORT_SYMBOL(of_platform_bus_probe);
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static int of_dev_node_match(struct device *dev, void *data)
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{
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return to_of_device(dev)->node == data;
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}
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struct of_device *of_find_device_by_node(struct device_node *np)
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{
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struct device *dev;
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dev = bus_find_device(&of_platform_bus_type,
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NULL, np, of_dev_node_match);
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if (dev)
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return to_of_device(dev);
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return NULL;
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}
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EXPORT_SYMBOL(of_find_device_by_node);
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static int of_dev_phandle_match(struct device *dev, void *data)
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{
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phandle *ph = data;
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2010-01-29 05:06:53 +08:00
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return to_of_device(dev)->node->phandle == *ph;
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2009-03-27 21:25:12 +08:00
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}
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struct of_device *of_find_device_by_phandle(phandle ph)
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{
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struct device *dev;
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dev = bus_find_device(&of_platform_bus_type,
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NULL, &ph, of_dev_phandle_match);
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if (dev)
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return to_of_device(dev);
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return NULL;
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}
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EXPORT_SYMBOL(of_find_device_by_phandle);
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