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8c8239c2c1
Many of the DT kerneldoc comments are lacking a 'Return' section. Let's add the section in cases we have a description of return values. There's still some cases where the return values are not documented. Cc: Frank Rowand <frowand.list@gmail.com> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Signed-off-by: Rob Herring <robh@kernel.org> Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Link: https://lore.kernel.org/r/20210325164713.1296407-8-robh@kernel.org
734 lines
20 KiB
C
734 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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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* 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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#define pr_fmt(fmt) "OF: " fmt
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/amba/bus.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_iommu.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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const struct of_device_id of_default_bus_match_table[] = {
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{ .compatible = "simple-bus", },
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{ .compatible = "simple-mfd", },
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{ .compatible = "isa", },
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#ifdef CONFIG_ARM_AMBA
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{ .compatible = "arm,amba-bus", },
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#endif /* CONFIG_ARM_AMBA */
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{} /* Empty terminated list */
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};
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static const struct of_device_id of_skipped_node_table[] = {
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{ .compatible = "operating-points-v2", },
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{} /* Empty terminated list */
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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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* Takes a reference to the embedded struct device which needs to be dropped
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* after use.
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*
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* Return: 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_by_of_node(&platform_bus_type, np);
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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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#ifdef CONFIG_OF_ADDRESS
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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 the translated bus address to
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* derive a unique name. If it cannot, then it will prepend names from
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* parent nodes until a unique name can be derived.
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*/
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static void of_device_make_bus_id(struct device *dev)
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{
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struct device_node *node = dev->of_node;
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const __be32 *reg;
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u64 addr;
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/* Construct the name, using parent nodes if necessary to ensure uniqueness */
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while (node->parent) {
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/*
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* If the address can be translated, then that is as much
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* uniqueness as we need. Make it the first component and return
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*/
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reg = of_get_property(node, "reg", NULL);
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if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {
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dev_set_name(dev, dev_name(dev) ? "%llx.%pOFn:%s" : "%llx.%pOFn",
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addr, node, dev_name(dev));
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return;
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}
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/* format arguments only used if dev_name() resolves to NULL */
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dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s",
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kbasename(node->full_name), dev_name(dev));
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node = node->parent;
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}
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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("", PLATFORM_DEVID_NONE);
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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 = kcalloc(num_irq + num_reg, sizeof(*res), 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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if (of_irq_to_resource_table(np, res, num_irq) != num_irq)
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pr_debug("not all legacy IRQ resources mapped for %pOFn\n",
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np);
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}
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dev->dev.of_node = of_node_get(np);
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dev->dev.fwnode = &np->fwnode;
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dev->dev.parent = parent ? : &platform_bus;
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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_pdata - 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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* @platform_data: pointer to populate platform_data pointer with
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* @parent: Linux device model parent device.
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*
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* Return: 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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static struct platform_device *of_platform_device_create_pdata(
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struct device_node *np,
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const char *bus_id,
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void *platform_data,
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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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of_node_test_and_set_flag(np, OF_POPULATED))
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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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goto err_clear_flag;
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dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
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if (!dev->dev.dma_mask)
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dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
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dev->dev.bus = &platform_bus_type;
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dev->dev.platform_data = platform_data;
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of_msi_configure(&dev->dev, dev->dev.of_node);
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if (of_device_add(dev) != 0) {
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platform_device_put(dev);
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goto err_clear_flag;
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}
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return dev;
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err_clear_flag:
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of_node_clear_flag(np, OF_POPULATED);
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return NULL;
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}
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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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* Return: 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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return of_platform_device_create_pdata(np, bus_id, NULL, parent);
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}
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EXPORT_SYMBOL(of_platform_device_create);
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#ifdef CONFIG_ARM_AMBA
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static struct amba_device *of_amba_device_create(struct device_node *node,
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const char *bus_id,
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void *platform_data,
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struct device *parent)
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{
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struct amba_device *dev;
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const void *prop;
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int i, ret;
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pr_debug("Creating amba device %pOF\n", node);
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if (!of_device_is_available(node) ||
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of_node_test_and_set_flag(node, OF_POPULATED))
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return NULL;
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dev = amba_device_alloc(NULL, 0, 0);
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if (!dev)
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goto err_clear_flag;
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/* AMBA devices only support a single DMA mask */
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dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
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dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
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/* setup generic device info */
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dev->dev.of_node = of_node_get(node);
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dev->dev.fwnode = &node->fwnode;
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dev->dev.parent = parent ? : &platform_bus;
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dev->dev.platform_data = platform_data;
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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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/* Allow the HW Peripheral ID to be overridden */
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prop = of_get_property(node, "arm,primecell-periphid", NULL);
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if (prop)
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dev->periphid = of_read_ulong(prop, 1);
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/* Decode the IRQs and address ranges */
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for (i = 0; i < AMBA_NR_IRQS; i++)
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dev->irq[i] = irq_of_parse_and_map(node, i);
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ret = of_address_to_resource(node, 0, &dev->res);
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if (ret) {
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pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n",
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ret, node);
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goto err_free;
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}
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ret = amba_device_add(dev, &iomem_resource);
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if (ret) {
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pr_err("amba_device_add() failed (%d) for %pOF\n",
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ret, node);
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goto err_free;
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}
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return dev;
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err_free:
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amba_device_put(dev);
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err_clear_flag:
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of_node_clear_flag(node, OF_POPULATED);
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return NULL;
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}
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#else /* CONFIG_ARM_AMBA */
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static struct amba_device *of_amba_device_create(struct device_node *node,
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const char *bus_id,
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void *platform_data,
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struct device *parent)
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{
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return NULL;
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}
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#endif /* CONFIG_ARM_AMBA */
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/*
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* of_dev_lookup() - Given a device node, lookup the preferred Linux name
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*/
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static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
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struct device_node *np)
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{
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const struct of_dev_auxdata *auxdata;
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struct resource res;
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int compatible = 0;
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if (!lookup)
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return NULL;
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auxdata = lookup;
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for (; auxdata->compatible; auxdata++) {
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if (!of_device_is_compatible(np, auxdata->compatible))
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continue;
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compatible++;
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if (!of_address_to_resource(np, 0, &res))
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if (res.start != auxdata->phys_addr)
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continue;
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pr_debug("%pOF: devname=%s\n", np, auxdata->name);
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return auxdata;
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}
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if (!compatible)
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return NULL;
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/* Try compatible match if no phys_addr and name are specified */
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auxdata = lookup;
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for (; auxdata->compatible; auxdata++) {
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if (!of_device_is_compatible(np, auxdata->compatible))
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continue;
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if (!auxdata->phys_addr && !auxdata->name) {
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pr_debug("%pOF: compatible match\n", np);
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return auxdata;
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}
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}
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return NULL;
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}
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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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* @lookup: auxdata table for matching id and platform_data with device nodes
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* @parent: parent for new device, or NULL for top level.
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* @strict: require compatible property
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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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const struct of_dev_auxdata *lookup,
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struct device *parent, bool strict)
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{
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const struct of_dev_auxdata *auxdata;
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struct device_node *child;
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struct platform_device *dev;
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const char *bus_id = NULL;
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void *platform_data = NULL;
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int rc = 0;
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/* Make sure it has a compatible property */
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if (strict && (!of_get_property(bus, "compatible", NULL))) {
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pr_debug("%s() - skipping %pOF, no compatible prop\n",
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__func__, bus);
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return 0;
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}
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/* Skip nodes for which we don't want to create devices */
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if (unlikely(of_match_node(of_skipped_node_table, bus))) {
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pr_debug("%s() - skipping %pOF node\n", __func__, bus);
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return 0;
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}
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if (of_node_check_flag(bus, OF_POPULATED_BUS)) {
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pr_debug("%s() - skipping %pOF, already populated\n",
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__func__, bus);
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return 0;
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}
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auxdata = of_dev_lookup(lookup, bus);
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if (auxdata) {
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bus_id = auxdata->name;
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platform_data = auxdata->platform_data;
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}
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if (of_device_is_compatible(bus, "arm,primecell")) {
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/*
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* Don't return an error here to keep compatibility with older
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* device tree files.
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*/
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of_amba_device_create(bus, bus_id, platform_data, parent);
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return 0;
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}
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dev = of_platform_device_create_pdata(bus, bus_id, platform_data, 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: %pOF\n", child);
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rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
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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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of_node_set_flag(bus, OF_POPULATED_BUS);
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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("%s()\n", __func__);
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pr_debug(" starting at: %pOF\n", root);
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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, NULL, parent, false);
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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, NULL, parent, false);
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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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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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|
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/**
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* of_platform_populate() - Populate platform_devices from device tree data
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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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* @lookup: auxdata table for matching id and platform_data with device nodes
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* @parent: parent to hook devices from, NULL for toplevel
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*
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* Similar to of_platform_bus_probe(), this function walks the device tree
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* and creates devices from nodes. It differs in that it follows the modern
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* convention of requiring all device nodes to have a 'compatible' property,
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* and it is suitable for creating devices which are children of the root
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* node (of_platform_bus_probe will only create children of the root which
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* are selected by the @matches argument).
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*
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* New board support should be using this function instead of
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* of_platform_bus_probe().
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*
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* Return: 0 on success, < 0 on failure.
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*/
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int of_platform_populate(struct device_node *root,
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const struct of_device_id *matches,
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const struct of_dev_auxdata *lookup,
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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("%s()\n", __func__);
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pr_debug(" starting at: %pOF\n", root);
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device_links_supplier_sync_state_pause();
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for_each_child_of_node(root, child) {
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rc = of_platform_bus_create(child, matches, lookup, parent, true);
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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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device_links_supplier_sync_state_resume();
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of_node_set_flag(root, OF_POPULATED_BUS);
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|
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of_node_put(root);
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return rc;
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}
|
|
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" },
|
|
{ .compatible = "nvmem-rmem" },
|
|
{}
|
|
};
|
|
|
|
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_reverse(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.
|
|
*
|
|
* Return: 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);
|
|
platform_device_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 */
|
|
platform_device_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 */
|