arch/powerpc/kernel/of_platform.c - maze/linux - Git at Google

 /*
  *    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 <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/of_platform.h>

 #include <asm/errno.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 const struct of_device_id of_default_bus_ids[] = {
 	{ .type = "soc", },
 	{ .compatible = "soc", },
 	{ .type = "spider", },
 	{ .type = "axon", },
 	{ .type = "plb5", },
 	{ .type = "plb4", },
 	{ .type = "opb", },
 	{ .type = "ebc", },
 	{},
 };

 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);

 struct of_device* of_platform_device_create(struct device_node *np,
 					    const char *bus_id,
 					    struct device *parent)
 {
 	struct of_device *dev;

 	dev = of_device_alloc(np, bus_id, parent);
 	if (!dev)
 		return NULL;

 	dev->dma_mask = 0xffffffffUL;
 	dev->dev.bus = &of_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_register(dev) != 0) {
 		of_device_free(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(const struct device_node *bus,
 				  const struct of_device_id *matches,
 				  struct device *parent)
 {
 	struct device_node *child;
 	struct of_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)
 			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,
 			  const 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_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)
 			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);
 	if (phb->bus == NULL)
 		return -ENXIO;

 	/* 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 = {
 	.match_table = of_pci_phb_ids,
 	.probe = of_pci_phb_probe,
 	.driver = {
 		.name = "of-pci",
 	},
 };

 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 */
	/*
	* 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 <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/of_platform.h>

	#include <asm/errno.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 const struct of_device_id of_default_bus_ids[] = {
	{ .type = "soc", },
	{ .compatible = "soc", },
	{ .type = "spider", },
	{ .type = "axon", },
	{ .type = "plb5", },
	{ .type = "plb4", },
	{ .type = "opb", },
	{ .type = "ebc", },
	{},
	};

	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);

	struct of_device* of_platform_device_create(struct device_node *np,
	const char *bus_id,
	struct device *parent)
	{
	struct of_device *dev;

	dev = of_device_alloc(np, bus_id, parent);
	if (!dev)
	return NULL;

	dev->dma_mask = 0xffffffffUL;
	dev->dev.bus = &of_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_register(dev) != 0) {
	of_device_free(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(const struct device_node *bus,
	const struct of_device_id *matches,
	struct device *parent)
	{
	struct device_node *child;
	struct of_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)
	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,
	const 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_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)
	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);
	if (phb->bus == NULL)
	return -ENXIO;

	/* 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 = {
	.match_table = of_pci_phb_ids,
	.probe = of_pci_phb_probe,
	.driver = {
	.name = "of-pci",
	},
	};

	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 */