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32 results

platform.c

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  • platform.c 19.96 KiB
    // SPDX-License-Identifier: GPL-2.0+
    /*
     *    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
     */
    
    #define pr_fmt(fmt)	"OF: " fmt
    
    #include <linux/errno.h>
    #include <linux/module.h>
    #include <linux/amba/bus.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_iommu.h>
    #include <linux/of_irq.h>
    #include <linux/of_platform.h>
    #include <linux/platform_device.h>
    
    const struct of_device_id of_default_bus_match_table[] = {
    	{ .compatible = "simple-bus", },
    	{ .compatible = "simple-mfd", },
    	{ .compatible = "isa", },
    #ifdef CONFIG_ARM_AMBA
    	{ .compatible = "arm,amba-bus", },
    #endif /* CONFIG_ARM_AMBA */
    	{} /* Empty terminated list */
    };
    
    static const struct of_device_id of_skipped_node_table[] = {
    	{ .compatible = "operating-points-v2", },
    	{} /* Empty terminated list */
    };
    
    /**
     * of_find_device_by_node - Find the platform_device associated with a node
     * @np: Pointer to device tree node
     *
     * Takes a reference to the embedded struct device which needs to be dropped
     * after use.
     *
     * 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_by_of_node(&platform_bus_type, np);
    	return dev ? to_platform_device(dev) : NULL;
    }
    EXPORT_SYMBOL(of_find_device_by_node);
    
    #ifdef CONFIG_OF_ADDRESS
    /*
     * 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 the translated bus address to
     * derive a unique name. If it cannot, then it will prepend names from
     * parent nodes until a unique name can be derived.
     */
    static void of_device_make_bus_id(struct device *dev)
    {
    	struct device_node *node = dev->of_node;
    	const __be32 *reg;
    	u64 addr;
    
    	/* Construct the name, using parent nodes if necessary to ensure uniqueness */
    	while (node->parent) {
    		/*
    		 * If the address can be translated, then that is as much
    		 * uniqueness as we need. Make it the first component and return
    		 */
    		reg = of_get_property(node, "reg", NULL);
    		if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {
    			dev_set_name(dev, dev_name(dev) ? "%llx.%pOFn:%s" : "%llx.%pOFn",
    				     addr, node, dev_name(dev));
    			return;
    		}
    
    		/* format arguments only used if dev_name() resolves to NULL */
    		dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s",
    			     kbasename(node->full_name), dev_name(dev));
    		node = node->parent;
    	}
    }
    
    /**
     * 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("", PLATFORM_DEVID_NONE);
    	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 = kcalloc(num_irq + num_reg, sizeof(*res), 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);
    		}
    		if (of_irq_to_resource_table(np, res, num_irq) != num_irq)
    			pr_debug("not all legacy IRQ resources mapped for %pOFn\n",
    				 np);
    	}
    
    	dev->dev.of_node = of_node_get(np);
    	dev->dev.fwnode = &np->fwnode;
    	dev->dev.parent = parent ? : &platform_bus;
    
    	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_pdata - Alloc, initialize and register an of_device
     * @np: pointer to node to create device for
     * @bus_id: name to assign device
     * @platform_data: pointer to populate platform_data pointer with
     * @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.
     */
    static struct platform_device *of_platform_device_create_pdata(
    					struct device_node *np,
    					const char *bus_id,
    					void *platform_data,
    					struct device *parent)
    {
    	struct platform_device *dev;
    
    	if (!of_device_is_available(np) ||
    	    of_node_test_and_set_flag(np, OF_POPULATED))
    		return NULL;
    
    	dev = of_device_alloc(np, bus_id, parent);
    	if (!dev)
    		goto err_clear_flag;
    
    	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
    	if (!dev->dev.dma_mask)
    		dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
    	dev->dev.bus = &platform_bus_type;
    	dev->dev.platform_data = platform_data;
    	of_msi_configure(&dev->dev, dev->dev.of_node);
    
    	if (of_device_add(dev) != 0) {
    		platform_device_put(dev);
    		goto err_clear_flag;
    	}
    
    	return dev;
    
    err_clear_flag:
    	of_node_clear_flag(np, OF_POPULATED);
    	return NULL;
    }
    
    /**
     * 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)
    {
    	return of_platform_device_create_pdata(np, bus_id, NULL, parent);
    }
    EXPORT_SYMBOL(of_platform_device_create);
    
    #ifdef CONFIG_ARM_AMBA
    static struct amba_device *of_amba_device_create(struct device_node *node,
    						 const char *bus_id,
    						 void *platform_data,
    						 struct device *parent)
    {
    	struct amba_device *dev;
    	const void *prop;
    	int i, ret;
    
    	pr_debug("Creating amba device %pOF\n", node);
    
    	if (!of_device_is_available(node) ||
    	    of_node_test_and_set_flag(node, OF_POPULATED))
    		return NULL;
    
    	dev = amba_device_alloc(NULL, 0, 0);
    	if (!dev)
    		goto err_clear_flag;
    
    	/* AMBA devices only support a single DMA mask */
    	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
    	dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
    
    	/* setup generic device info */
    	dev->dev.of_node = of_node_get(node);
    	dev->dev.fwnode = &node->fwnode;
    	dev->dev.parent = parent ? : &platform_bus;
    	dev->dev.platform_data = platform_data;
    	if (bus_id)
    		dev_set_name(&dev->dev, "%s", bus_id);
    	else
    		of_device_make_bus_id(&dev->dev);
    
    	/* Allow the HW Peripheral ID to be overridden */
    	prop = of_get_property(node, "arm,primecell-periphid", NULL);
    	if (prop)
    		dev->periphid = of_read_ulong(prop, 1);
    
    	/* Decode the IRQs and address ranges */
    	for (i = 0; i < AMBA_NR_IRQS; i++)
    		dev->irq[i] = irq_of_parse_and_map(node, i);
    
    	ret = of_address_to_resource(node, 0, &dev->res);
    	if (ret) {
    		pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n",
    		       ret, node);
    		goto err_free;
    	}
    
    	ret = amba_device_add(dev, &iomem_resource);
    	if (ret) {
    		pr_err("amba_device_add() failed (%d) for %pOF\n",
    		       ret, node);
    		goto err_free;
    	}
    
    	return dev;
    
    err_free:
    	amba_device_put(dev);
    err_clear_flag:
    	of_node_clear_flag(node, OF_POPULATED);
    	return NULL;
    }
    #else /* CONFIG_ARM_AMBA */
    static struct amba_device *of_amba_device_create(struct device_node *node,
    						 const char *bus_id,
    						 void *platform_data,
    						 struct device *parent)
    {
    	return NULL;
    }
    #endif /* CONFIG_ARM_AMBA */
    
    /**
     * of_devname_lookup() - Given a device node, lookup the preferred Linux name
     */
    static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
    				 struct device_node *np)
    {
    	const struct of_dev_auxdata *auxdata;
    	struct resource res;
    	int compatible = 0;
    
    	if (!lookup)
    		return NULL;
    
    	auxdata = lookup;
    	for (; auxdata->compatible; auxdata++) {
    		if (!of_device_is_compatible(np, auxdata->compatible))
    			continue;
    		compatible++;
    		if (!of_address_to_resource(np, 0, &res))
    			if (res.start != auxdata->phys_addr)
    				continue;
    		pr_debug("%pOF: devname=%s\n", np, auxdata->name);
    		return auxdata;
    	}
    
    	if (!compatible)
    		return NULL;
    
    	/* Try compatible match if no phys_addr and name are specified */
    	auxdata = lookup;
    	for (; auxdata->compatible; auxdata++) {
    		if (!of_device_is_compatible(np, auxdata->compatible))
    			continue;
    		if (!auxdata->phys_addr && !auxdata->name) {
    			pr_debug("%pOF: compatible match\n", np);
    			return auxdata;
    		}
    	}
    
    	return NULL;
    }
    
    /**
     * of_platform_bus_create() - Create a device for a node and its children.
     * @bus: device node of the bus to instantiate
     * @matches: match table for bus nodes
     * @lookup: auxdata table for matching id and platform_data with device nodes
     * @parent: parent for new device, or NULL for top level.
     * @strict: require compatible property
     *
     * Creates a platform_device for the provided device_node, and optionally
     * recursively create devices for all the child nodes.
     */
    static int of_platform_bus_create(struct device_node *bus,
    				  const struct of_device_id *matches,
    				  const struct of_dev_auxdata *lookup,
    				  struct device *parent, bool strict)
    {
    	const struct of_dev_auxdata *auxdata;
    	struct device_node *child;
    	struct platform_device *dev;
    	const char *bus_id = NULL;
    	void *platform_data = NULL;
    	int rc = 0;
    
    	/* Make sure it has a compatible property */
    	if (strict && (!of_get_property(bus, "compatible", NULL))) {
    		pr_debug("%s() - skipping %pOF, no compatible prop\n",
    			 __func__, bus);
    		return 0;
    	}
    
    	/* Skip nodes for which we don't want to create devices */
    	if (unlikely(of_match_node(of_skipped_node_table, bus))) {
    		pr_debug("%s() - skipping %pOF node\n", __func__, bus);
    		return 0;
    	}
    
    	if (of_node_check_flag(bus, OF_POPULATED_BUS)) {
    		pr_debug("%s() - skipping %pOF, already populated\n",
    			__func__, bus);
    		return 0;
    	}
    
    	auxdata = of_dev_lookup(lookup, bus);
    	if (auxdata) {
    		bus_id = auxdata->name;
    		platform_data = auxdata->platform_data;
    	}
    
    	if (of_device_is_compatible(bus, "arm,primecell")) {
    		/*
    		 * Don't return an error here to keep compatibility with older
    		 * device tree files.
    		 */
    		of_amba_device_create(bus, bus_id, platform_data, parent);
    		return 0;
    	}
    
    	dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
    	if (!dev || !of_match_node(matches, bus))
    		return 0;
    
    	for_each_child_of_node(bus, child) {
    		pr_debug("   create child: %pOF\n", child);
    		rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
    		if (rc) {
    			of_node_put(child);
    			break;
    		}
    	}
    	of_node_set_flag(bus, OF_POPULATED_BUS);
    	return rc;
    }
    
    /**
     * of_platform_bus_probe() - Probe the device-tree for platform buses
     * @root: parent of the first level to probe or NULL for the root of the tree
     * @matches: match table for bus nodes
     * @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;
    	int rc = 0;
    
    	root = root ? of_node_get(root) : of_find_node_by_path("/");
    	if (!root)
    		return -EINVAL;
    
    	pr_debug("%s()\n", __func__);
    	pr_debug(" starting at: %pOF\n", root);
    
    	/* Do a self check of bus type, if there's a match, create children */
    	if (of_match_node(matches, root)) {
    		rc = of_platform_bus_create(root, matches, NULL, parent, false);
    	} else for_each_child_of_node(root, child) {
    		if (!of_match_node(matches, child))
    			continue;
    		rc = of_platform_bus_create(child, matches, NULL, parent, false);
    		if (rc) {
    			of_node_put(child);
    			break;
    		}
    	}
    
    	of_node_put(root);
    	return rc;
    }
    EXPORT_SYMBOL(of_platform_bus_probe);
    
    /**
     * of_platform_populate() - Populate platform_devices from device tree data
     * @root: parent of the first level to probe or NULL for the root of the tree
     * @matches: match table, NULL to use the default
     * @lookup: auxdata table for matching id and platform_data with device nodes
     * @parent: parent to hook devices from, NULL for toplevel
     *
     * Similar to of_platform_bus_probe(), this function walks the device tree
     * and creates devices from nodes.  It differs in that it follows the modern
     * convention of requiring all device nodes to have a 'compatible' property,
     * and it is suitable for creating devices which are children of the root
     * node (of_platform_bus_probe will only create children of the root which
     * are selected by the @matches argument).
     *
     * New board support should be using this function instead of
     * of_platform_bus_probe().
     *
     * Returns 0 on success, < 0 on failure.
     */
    int of_platform_populate(struct device_node *root,
    			const struct of_device_id *matches,
    			const struct of_dev_auxdata *lookup,
    			struct device *parent)
    {
    	struct device_node *child;
    	int rc = 0;
    
    	root = root ? of_node_get(root) : of_find_node_by_path("/");
    	if (!root)
    		return -EINVAL;
    
    	pr_debug("%s()\n", __func__);
    	pr_debug(" starting at: %pOF\n", root);
    
    	device_links_supplier_sync_state_pause();
    	for_each_child_of_node(root, child) {
    		rc = of_platform_bus_create(child, matches, lookup, parent, true);
    		if (rc) {
    			of_node_put(child);
    			break;
    		}
    	}
    	device_links_supplier_sync_state_resume();
    
    	of_node_set_flag(root, OF_POPULATED_BUS);
    
    	of_node_put(root);
    	return rc;
    }
    EXPORT_SYMBOL_GPL(of_platform_populate);
    
    int of_platform_default_populate(struct device_node *root,
    				 const struct of_dev_auxdata *lookup,
    				 struct device *parent)
    {
    	return of_platform_populate(root, of_default_bus_match_table, lookup,
    				    parent);
    }
    EXPORT_SYMBOL_GPL(of_platform_default_populate);
    
    #ifndef CONFIG_PPC
    static const struct of_device_id reserved_mem_matches[] = {
    	{ .compatible = "qcom,rmtfs-mem" },
    	{ .compatible = "qcom,cmd-db" },
    	{ .compatible = "ramoops" },
    	{}
    };
    
    static int __init of_platform_default_populate_init(void)
    {
    	struct device_node *node;
    
    	device_links_supplier_sync_state_pause();
    
    	if (!of_have_populated_dt())
    		return -ENODEV;
    
    	/*
    	 * Handle certain compatibles explicitly, since we don't want to create
    	 * platform_devices for every node in /reserved-memory with a
    	 * "compatible",
    	 */
    	for_each_matching_node(node, reserved_mem_matches)
    		of_platform_device_create(node, NULL, NULL);
    
    	node = of_find_node_by_path("/firmware");
    	if (node) {
    		of_platform_populate(node, NULL, NULL, NULL);
    		of_node_put(node);
    	}
    
    	/* Populate everything else. */
    	of_platform_default_populate(NULL, NULL, NULL);
    
    	return 0;
    }
    arch_initcall_sync(of_platform_default_populate_init);
    
    static int __init of_platform_sync_state_init(void)
    {
    	device_links_supplier_sync_state_resume();
    	return 0;
    }
    late_initcall_sync(of_platform_sync_state_init);
    #endif
    
    int of_platform_device_destroy(struct device *dev, void *data)
    {
    	/* Do not touch devices not populated from the device tree */
    	if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))
    		return 0;
    
    	/* Recurse for any nodes that were treated as busses */
    	if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))
    		device_for_each_child(dev, NULL, of_platform_device_destroy);
    
    	of_node_clear_flag(dev->of_node, OF_POPULATED);
    	of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);
    
    	if (dev->bus == &platform_bus_type)
    		platform_device_unregister(to_platform_device(dev));
    #ifdef CONFIG_ARM_AMBA
    	else if (dev->bus == &amba_bustype)
    		amba_device_unregister(to_amba_device(dev));
    #endif
    
    	return 0;
    }
    EXPORT_SYMBOL_GPL(of_platform_device_destroy);
    
    /**
     * of_platform_depopulate() - Remove devices populated from device tree
     * @parent: device which children will be removed
     *
     * Complementary to of_platform_populate(), this function removes children
     * of the given device (and, recurrently, their children) that have been
     * created from their respective device tree nodes (and only those,
     * leaving others - eg. manually created - unharmed).
     */
    void of_platform_depopulate(struct device *parent)
    {
    	if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {
    		device_for_each_child(parent, NULL, of_platform_device_destroy);
    		of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);
    	}
    }
    EXPORT_SYMBOL_GPL(of_platform_depopulate);
    
    static void devm_of_platform_populate_release(struct device *dev, void *res)
    {
    	of_platform_depopulate(*(struct device **)res);
    }
    
    /**
     * devm_of_platform_populate() - Populate platform_devices from device tree data
     * @dev: device that requested to populate from device tree data
     *
     * Similar to of_platform_populate(), but will automatically call
     * of_platform_depopulate() when the device is unbound from the bus.
     *
     * Returns 0 on success, < 0 on failure.
     */
    int devm_of_platform_populate(struct device *dev)
    {
    	struct device **ptr;
    	int ret;
    
    	if (!dev)
    		return -EINVAL;
    
    	ptr = devres_alloc(devm_of_platform_populate_release,
    			   sizeof(*ptr), GFP_KERNEL);
    	if (!ptr)
    		return -ENOMEM;
    
    	ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
    	if (ret) {
    		devres_free(ptr);
    	} else {
    		*ptr = dev;
    		devres_add(dev, ptr);
    	}
    
    	return ret;
    }
    EXPORT_SYMBOL_GPL(devm_of_platform_populate);
    
    static int devm_of_platform_match(struct device *dev, void *res, void *data)
    {
    	struct device **ptr = res;
    
    	if (!ptr) {
    		WARN_ON(!ptr);
    		return 0;
    	}
    
    	return *ptr == data;
    }
    
    /**
     * devm_of_platform_depopulate() - Remove devices populated from device tree
     * @dev: device that requested to depopulate from device tree data
     *
     * Complementary to devm_of_platform_populate(), this function removes children
     * of the given device (and, recurrently, their children) that have been
     * created from their respective device tree nodes (and only those,
     * leaving others - eg. manually created - unharmed).
     */
    void devm_of_platform_depopulate(struct device *dev)
    {
    	int ret;
    
    	ret = devres_release(dev, devm_of_platform_populate_release,
    			     devm_of_platform_match, dev);
    
    	WARN_ON(ret);
    }
    EXPORT_SYMBOL_GPL(devm_of_platform_depopulate);
    
    #ifdef CONFIG_OF_DYNAMIC
    static int of_platform_notify(struct notifier_block *nb,
    				unsigned long action, void *arg)
    {
    	struct of_reconfig_data *rd = arg;
    	struct platform_device *pdev_parent, *pdev;
    	bool children_left;
    
    	switch (of_reconfig_get_state_change(action, rd)) {
    	case OF_RECONFIG_CHANGE_ADD:
    		/* verify that the parent is a bus */
    		if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))
    			return NOTIFY_OK;	/* not for us */
    
    		/* already populated? (driver using of_populate manually) */
    		if (of_node_check_flag(rd->dn, OF_POPULATED))
    			return NOTIFY_OK;
    
    		/* pdev_parent may be NULL when no bus platform device */
    		pdev_parent = of_find_device_by_node(rd->dn->parent);
    		pdev = of_platform_device_create(rd->dn, NULL,
    				pdev_parent ? &pdev_parent->dev : NULL);
    		of_dev_put(pdev_parent);
    
    		if (pdev == NULL) {
    			pr_err("%s: failed to create for '%pOF'\n",
    					__func__, rd->dn);
    			/* of_platform_device_create tosses the error code */
    			return notifier_from_errno(-EINVAL);
    		}
    		break;
    
    	case OF_RECONFIG_CHANGE_REMOVE:
    
    		/* already depopulated? */
    		if (!of_node_check_flag(rd->dn, OF_POPULATED))
    			return NOTIFY_OK;
    
    		/* find our device by node */
    		pdev = of_find_device_by_node(rd->dn);
    		if (pdev == NULL)
    			return NOTIFY_OK;	/* no? not meant for us */
    
    		/* unregister takes one ref away */
    		of_platform_device_destroy(&pdev->dev, &children_left);
    
    		/* and put the reference of the find */
    		of_dev_put(pdev);
    		break;
    	}
    
    	return NOTIFY_OK;
    }
    
    static struct notifier_block platform_of_notifier = {
    	.notifier_call = of_platform_notify,
    };
    
    void of_platform_register_reconfig_notifier(void)
    {
    	WARN_ON(of_reconfig_notifier_register(&platform_of_notifier));
    }
    #endif /* CONFIG_OF_DYNAMIC */
    
    #endif /* CONFIG_OF_ADDRESS */