![Grant Likely](/assets/img/avatar_default.png)
There are no users of OF_NO_DEEP_PROBE, and of_match_node() now gracefully handles being passed a NULL pointer, so the checks at the top of of_platform_bus_probe can be dropped. While at it, consolidate the root node pointer check to be easier to read and tidy up related comments. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
284 lines
7.6 KiB
C
284 lines
7.6 KiB
C
/*
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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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* Merged from powerpc/kernel/of_platform.c and
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* sparc{,64}/kernel/of_device.c by Stephen Rothwell
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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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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/slab.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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static int of_dev_node_match(struct device *dev, void *data)
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{
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return dev->of_node == data;
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}
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/**
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* of_find_device_by_node - Find the platform_device associated with a node
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* @np: Pointer to device tree node
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*
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* Returns platform_device pointer, or NULL if not found
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*/
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struct platform_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(&platform_bus_type, NULL, np, of_dev_node_match);
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return dev ? to_platform_device(dev) : NULL;
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}
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EXPORT_SYMBOL(of_find_device_by_node);
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#if defined(CONFIG_PPC_DCR)
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#include <asm/dcr.h>
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#endif
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#if !defined(CONFIG_SPARC)
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/*
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* The following routines scan a subtree and registers a device for
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* each applicable node.
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*
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* Note: sparc doesn't use these routines because it has a different
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* mechanism for creating devices from device tree nodes.
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*/
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/**
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* of_device_make_bus_id - Use the device node data to assign a unique name
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* @dev: pointer to device structure that is linked to a device tree node
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*
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* This routine will first try using either the dcr-reg or the reg property
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* value to derive a unique name. As a last resort it will use the node
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* name followed by a unique number.
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*/
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void of_device_make_bus_id(struct device *dev)
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{
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static atomic_t bus_no_reg_magic;
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struct device_node *node = dev->of_node;
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const u32 *reg;
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u64 addr;
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int magic;
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#ifdef CONFIG_PPC_DCR
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/*
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* If it's a DCR based device, use 'd' for native DCRs
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* and 'D' for MMIO DCRs.
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*/
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reg = of_get_property(node, "dcr-reg", NULL);
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if (reg) {
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#ifdef CONFIG_PPC_DCR_NATIVE
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dev_set_name(dev, "d%x.%s", *reg, node->name);
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#else /* CONFIG_PPC_DCR_NATIVE */
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u64 addr = of_translate_dcr_address(node, *reg, NULL);
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if (addr != OF_BAD_ADDR) {
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dev_set_name(dev, "D%llx.%s",
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(unsigned long long)addr, node->name);
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return;
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}
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#endif /* !CONFIG_PPC_DCR_NATIVE */
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}
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#endif /* CONFIG_PPC_DCR */
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/*
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* For MMIO, get the physical address
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*/
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reg = of_get_property(node, "reg", NULL);
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if (reg) {
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addr = of_translate_address(node, reg);
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if (addr != OF_BAD_ADDR) {
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dev_set_name(dev, "%llx.%s",
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(unsigned long long)addr, node->name);
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return;
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}
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}
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/*
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* No BusID, use the node name and add a globally incremented
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* counter (and pray...)
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*/
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magic = atomic_add_return(1, &bus_no_reg_magic);
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dev_set_name(dev, "%s.%d", node->name, magic - 1);
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}
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/**
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* of_device_alloc - Allocate and initialize an of_device
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* @np: device node to assign to device
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* @bus_id: Name to assign to the device. May be null to use default name.
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* @parent: Parent device.
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*/
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struct platform_device *of_device_alloc(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 platform_device *dev;
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int rc, i, num_reg = 0, num_irq;
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struct resource *res, temp_res;
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dev = platform_device_alloc("", -1);
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if (!dev)
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return NULL;
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/* count the io and irq resources */
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while (of_address_to_resource(np, num_reg, &temp_res) == 0)
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num_reg++;
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num_irq = of_irq_count(np);
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/* Populate the resource table */
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if (num_irq || num_reg) {
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res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL);
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if (!res) {
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platform_device_put(dev);
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return NULL;
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}
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dev->num_resources = num_reg + num_irq;
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dev->resource = res;
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for (i = 0; i < num_reg; i++, res++) {
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rc = of_address_to_resource(np, i, res);
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WARN_ON(rc);
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}
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WARN_ON(of_irq_to_resource_table(np, res, num_irq) != num_irq);
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}
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dev->dev.of_node = of_node_get(np);
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#if defined(CONFIG_PPC) || defined(CONFIG_MICROBLAZE)
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dev->dev.dma_mask = &dev->archdata.dma_mask;
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#endif
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dev->dev.parent = parent;
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if (bus_id)
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dev_set_name(&dev->dev, "%s", bus_id);
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else
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of_device_make_bus_id(&dev->dev);
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return dev;
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}
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EXPORT_SYMBOL(of_device_alloc);
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/**
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* of_platform_device_create - Alloc, initialize and register an of_device
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* @np: pointer to node to create device for
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* @bus_id: name to assign device
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* @parent: Linux device model parent device.
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*
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* Returns pointer to created platform device, or NULL if a device was not
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* registered. Unavailable devices will not get registered.
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*/
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struct platform_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 platform_device *dev;
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if (!of_device_is_available(np))
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return NULL;
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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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#if defined(CONFIG_PPC) || defined(CONFIG_MICROBLAZE)
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dev->archdata.dma_mask = 0xffffffffUL;
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#endif
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dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
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dev->dev.bus = &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_add(dev) != 0) {
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platform_device_put(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 a device for a node and its children.
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* @bus: device node of the bus to instantiate
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* @matches: match table for bus nodes
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* disallow recursive creation of child buses
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* @parent: parent for new device, or NULL for top level.
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*
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* Creates a platform_device for the provided device_node, and optionally
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* recursively create devices for all the child nodes.
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*/
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static int of_platform_bus_create(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 platform_device *dev;
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int rc = 0;
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dev = of_platform_device_create(bus, NULL, parent);
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if (!dev || !of_match_node(matches, bus))
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return 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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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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return rc;
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}
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/**
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* of_platform_bus_probe() - Probe the device-tree for platform buses
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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 for bus nodes
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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 instantiated 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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int rc = 0;
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root = root ? of_node_get(root) : of_find_node_by_path("/");
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if (!root)
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return -EINVAL;
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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 children */
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if (of_match_node(matches, root)) {
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rc = of_platform_bus_create(root, matches, parent);
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} else 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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rc = of_platform_bus_create(child, matches, parent);
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if (rc)
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break;
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}
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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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#endif /* !CONFIG_SPARC */
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