drivers/of/platform.c - fp2-dev/kernel/msm - Gitiles

 /*
  *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
  *			 <benh@kernel.crashing.org>
  *    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 <linux/errno.h>
 #include <linux/module.h>
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/slab.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>

 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);

 #if defined(CONFIG_PPC_DCR)
 #include <asm/dcr.h>
 #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 */
	/*
	* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
	* <benh@kernel.crashing.org>
	* 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 <linux/errno.h>
	#include <linux/module.h>
	#include <linux/device.h>
	#include <linux/dma-mapping.h>
	#include <linux/slab.h>
	#include <linux/of_address.h>
	#include <linux/of_device.h>
	#include <linux/of_irq.h>
	#include <linux/of_platform.h>
	#include <linux/platform_device.h>

	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);

	#if defined(CONFIG_PPC_DCR)
	#include <asm/dcr.h>
	#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 */