![Grant Likely](/assets/img/avatar_default.png)
Device nodes with the property status="disabled" are not usable and so don't register them when parsing the device tree for devices. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Hollis Blanchard <hollis_blanchard@mentor.com> Cc: Deepak Saxena <deepak_saxena@mentor.com> Cc: Scott Wood <scottwood@freescale.com>, Cc: David Gibson <david@gibson.dropbear.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
771 lines
18 KiB
C
771 lines
18 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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static int platform_driver_probe_shim(struct platform_device *pdev)
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{
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struct platform_driver *pdrv;
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struct of_platform_driver *ofpdrv;
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const struct of_device_id *match;
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pdrv = container_of(pdev->dev.driver, struct platform_driver, driver);
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ofpdrv = container_of(pdrv, struct of_platform_driver, platform_driver);
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/* There is an unlikely chance that an of_platform driver might match
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* on a non-OF platform device. If so, then of_match_device() will
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* come up empty. Return -EINVAL in this case so other drivers get
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* the chance to bind. */
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match = of_match_device(pdev->dev.driver->of_match_table, &pdev->dev);
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return match ? ofpdrv->probe(pdev, match) : -EINVAL;
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}
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static void platform_driver_shutdown_shim(struct platform_device *pdev)
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{
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struct platform_driver *pdrv;
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struct of_platform_driver *ofpdrv;
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pdrv = container_of(pdev->dev.driver, struct platform_driver, driver);
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ofpdrv = container_of(pdrv, struct of_platform_driver, platform_driver);
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ofpdrv->shutdown(pdev);
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}
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/**
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* of_register_platform_driver
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*/
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int of_register_platform_driver(struct of_platform_driver *drv)
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{
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char *of_name;
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/* setup of_platform_driver to platform_driver adaptors */
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drv->platform_driver.driver = drv->driver;
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/* Prefix the driver name with 'of:' to avoid namespace collisions
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* and bogus matches. There are some drivers in the tree that
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* register both an of_platform_driver and a platform_driver with
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* the same name. This is a temporary measure until they are all
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* cleaned up --gcl July 29, 2010 */
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of_name = kmalloc(strlen(drv->driver.name) + 5, GFP_KERNEL);
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if (!of_name)
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return -ENOMEM;
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sprintf(of_name, "of:%s", drv->driver.name);
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drv->platform_driver.driver.name = of_name;
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if (drv->probe)
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drv->platform_driver.probe = platform_driver_probe_shim;
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drv->platform_driver.remove = drv->remove;
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if (drv->shutdown)
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drv->platform_driver.shutdown = platform_driver_shutdown_shim;
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drv->platform_driver.suspend = drv->suspend;
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drv->platform_driver.resume = drv->resume;
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return platform_driver_register(&drv->platform_driver);
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}
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EXPORT_SYMBOL(of_register_platform_driver);
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void of_unregister_platform_driver(struct of_platform_driver *drv)
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{
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platform_driver_unregister(&drv->platform_driver);
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kfree(drv->platform_driver.driver.name);
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drv->platform_driver.driver.name = NULL;
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}
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EXPORT_SYMBOL(of_unregister_platform_driver);
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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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extern struct device_attribute of_platform_device_attrs[];
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static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
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{
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const struct of_device_id *matches = drv->of_match_table;
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if (!matches)
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return 0;
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return of_match_device(matches, dev) != NULL;
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}
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static int of_platform_device_probe(struct device *dev)
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{
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int error = -ENODEV;
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struct of_platform_driver *drv;
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struct platform_device *of_dev;
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const struct of_device_id *match;
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drv = to_of_platform_driver(dev->driver);
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of_dev = to_platform_device(dev);
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if (!drv->probe)
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return error;
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of_dev_get(of_dev);
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match = of_match_device(drv->driver.of_match_table, dev);
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if (match)
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error = drv->probe(of_dev, match);
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if (error)
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of_dev_put(of_dev);
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return error;
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}
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static int of_platform_device_remove(struct device *dev)
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{
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struct platform_device *of_dev = to_platform_device(dev);
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struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
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if (dev->driver && drv->remove)
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drv->remove(of_dev);
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return 0;
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}
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static void of_platform_device_shutdown(struct device *dev)
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{
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struct platform_device *of_dev = to_platform_device(dev);
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struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
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if (dev->driver && drv->shutdown)
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drv->shutdown(of_dev);
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}
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#ifdef CONFIG_PM_SLEEP
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static int of_platform_legacy_suspend(struct device *dev, pm_message_t mesg)
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{
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struct platform_device *of_dev = to_platform_device(dev);
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struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
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int ret = 0;
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if (dev->driver && drv->suspend)
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ret = drv->suspend(of_dev, mesg);
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return ret;
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}
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static int of_platform_legacy_resume(struct device *dev)
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{
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struct platform_device *of_dev = to_platform_device(dev);
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struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
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int ret = 0;
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if (dev->driver && drv->resume)
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ret = drv->resume(of_dev);
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return ret;
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}
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static int of_platform_pm_prepare(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int ret = 0;
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if (drv && drv->pm && drv->pm->prepare)
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ret = drv->pm->prepare(dev);
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return ret;
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}
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static void of_platform_pm_complete(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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if (drv && drv->pm && drv->pm->complete)
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drv->pm->complete(dev);
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}
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#ifdef CONFIG_SUSPEND
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static int of_platform_pm_suspend(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int ret = 0;
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if (!drv)
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return 0;
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if (drv->pm) {
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if (drv->pm->suspend)
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ret = drv->pm->suspend(dev);
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} else {
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ret = of_platform_legacy_suspend(dev, PMSG_SUSPEND);
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}
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return ret;
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}
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static int of_platform_pm_suspend_noirq(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int ret = 0;
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if (!drv)
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return 0;
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if (drv->pm) {
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if (drv->pm->suspend_noirq)
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ret = drv->pm->suspend_noirq(dev);
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}
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return ret;
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}
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static int of_platform_pm_resume(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int ret = 0;
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if (!drv)
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return 0;
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if (drv->pm) {
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if (drv->pm->resume)
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ret = drv->pm->resume(dev);
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} else {
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ret = of_platform_legacy_resume(dev);
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}
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return ret;
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}
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static int of_platform_pm_resume_noirq(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int ret = 0;
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if (!drv)
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return 0;
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if (drv->pm) {
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if (drv->pm->resume_noirq)
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ret = drv->pm->resume_noirq(dev);
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}
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return ret;
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}
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#else /* !CONFIG_SUSPEND */
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#define of_platform_pm_suspend NULL
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#define of_platform_pm_resume NULL
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#define of_platform_pm_suspend_noirq NULL
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#define of_platform_pm_resume_noirq NULL
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#endif /* !CONFIG_SUSPEND */
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#ifdef CONFIG_HIBERNATION
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static int of_platform_pm_freeze(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int ret = 0;
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if (!drv)
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return 0;
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if (drv->pm) {
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if (drv->pm->freeze)
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ret = drv->pm->freeze(dev);
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} else {
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ret = of_platform_legacy_suspend(dev, PMSG_FREEZE);
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}
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return ret;
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}
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static int of_platform_pm_freeze_noirq(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int ret = 0;
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if (!drv)
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return 0;
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if (drv->pm) {
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if (drv->pm->freeze_noirq)
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ret = drv->pm->freeze_noirq(dev);
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}
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return ret;
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}
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static int of_platform_pm_thaw(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int ret = 0;
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if (!drv)
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return 0;
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if (drv->pm) {
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if (drv->pm->thaw)
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ret = drv->pm->thaw(dev);
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} else {
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ret = of_platform_legacy_resume(dev);
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}
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return ret;
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}
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static int of_platform_pm_thaw_noirq(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int ret = 0;
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if (!drv)
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return 0;
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if (drv->pm) {
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if (drv->pm->thaw_noirq)
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ret = drv->pm->thaw_noirq(dev);
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}
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return ret;
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}
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static int of_platform_pm_poweroff(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int ret = 0;
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if (!drv)
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return 0;
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if (drv->pm) {
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if (drv->pm->poweroff)
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ret = drv->pm->poweroff(dev);
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} else {
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ret = of_platform_legacy_suspend(dev, PMSG_HIBERNATE);
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}
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return ret;
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}
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static int of_platform_pm_poweroff_noirq(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int ret = 0;
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if (!drv)
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return 0;
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if (drv->pm) {
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if (drv->pm->poweroff_noirq)
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ret = drv->pm->poweroff_noirq(dev);
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}
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return ret;
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}
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static int of_platform_pm_restore(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int ret = 0;
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if (!drv)
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return 0;
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if (drv->pm) {
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if (drv->pm->restore)
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ret = drv->pm->restore(dev);
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} else {
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ret = of_platform_legacy_resume(dev);
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}
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return ret;
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}
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static int of_platform_pm_restore_noirq(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int ret = 0;
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if (!drv)
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return 0;
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if (drv->pm) {
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if (drv->pm->restore_noirq)
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ret = drv->pm->restore_noirq(dev);
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}
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return ret;
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}
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#else /* !CONFIG_HIBERNATION */
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#define of_platform_pm_freeze NULL
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#define of_platform_pm_thaw NULL
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#define of_platform_pm_poweroff NULL
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#define of_platform_pm_restore NULL
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#define of_platform_pm_freeze_noirq NULL
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#define of_platform_pm_thaw_noirq NULL
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#define of_platform_pm_poweroff_noirq NULL
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#define of_platform_pm_restore_noirq NULL
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#endif /* !CONFIG_HIBERNATION */
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static struct dev_pm_ops of_platform_dev_pm_ops = {
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.prepare = of_platform_pm_prepare,
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.complete = of_platform_pm_complete,
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.suspend = of_platform_pm_suspend,
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.resume = of_platform_pm_resume,
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.freeze = of_platform_pm_freeze,
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.thaw = of_platform_pm_thaw,
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.poweroff = of_platform_pm_poweroff,
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.restore = of_platform_pm_restore,
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.suspend_noirq = of_platform_pm_suspend_noirq,
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.resume_noirq = of_platform_pm_resume_noirq,
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.freeze_noirq = of_platform_pm_freeze_noirq,
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.thaw_noirq = of_platform_pm_thaw_noirq,
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.poweroff_noirq = of_platform_pm_poweroff_noirq,
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.restore_noirq = of_platform_pm_restore_noirq,
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};
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#define OF_PLATFORM_PM_OPS_PTR (&of_platform_dev_pm_ops)
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#else /* !CONFIG_PM_SLEEP */
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#define OF_PLATFORM_PM_OPS_PTR NULL
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#endif /* !CONFIG_PM_SLEEP */
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int of_bus_type_init(struct bus_type *bus, const char *name)
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{
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bus->name = name;
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bus->match = of_platform_bus_match;
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bus->probe = of_platform_device_probe;
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bus->remove = of_platform_device_remove;
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bus->shutdown = of_platform_device_shutdown;
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bus->dev_attrs = of_platform_device_attrs;
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bus->pm = OF_PLATFORM_PM_OPS_PTR;
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return bus_register(bus);
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}
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int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
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{
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/*
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* Temporary: of_platform_bus used to be distinct from the platform
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* bus. It isn't anymore, and so drivers on the platform bus need
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* to be registered in a special way.
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*
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* After all of_platform_bus_type drivers are converted to
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* platform_drivers, this exception can be removed.
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*/
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if (bus == &platform_bus_type)
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return of_register_platform_driver(drv);
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/* register with core */
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drv->driver.bus = bus;
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return driver_register(&drv->driver);
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}
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EXPORT_SYMBOL(of_register_driver);
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void of_unregister_driver(struct of_platform_driver *drv)
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{
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if (drv->driver.bus == &platform_bus_type)
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of_unregister_platform_driver(drv);
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else
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driver_unregister(&drv->driver);
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}
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EXPORT_SYMBOL(of_unregister_driver);
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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);
|
|
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 */
|