cregit-Linux how code gets into the kernel

Release 4.7 drivers/of/platform.c

Directory: drivers/of
/*
 *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
 *                       <benh@kernel.crashing.org>
 *    and                Arnd Bergmann, IBM Corp.
 *    Merged from powerpc/kernel/of_platform.c and
 *    sparc{,64}/kernel/of_device.c by Stephen Rothwell
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/amba/bus.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>


const struct of_device_id of_default_bus_match_table[] = {
	{ .compatible = "simple-bus", },
	{ .compatible = "simple-mfd", },
#ifdef CONFIG_ARM_AMBA
	{ .compatible = "arm,amba-bus", },
#endif /* CONFIG_ARM_AMBA */
	{} /* Empty terminated list */
};

EXPORT_SYMBOL(of_default_bus_match_table);


static int of_dev_node_match(struct device *dev, void *data) { return dev->of_node == data; }

Contributors

PersonTokensPropCommitsCommitProp
jonas bonnjonas bonn22100.00%1100.00%
Total22100.00%1100.00%

/** * of_find_device_by_node - Find the platform_device associated with a node * @np: Pointer to device tree node * * Returns platform_device pointer, or NULL if not found */
struct platform_device *of_find_device_by_node(struct device_node *np) { struct device *dev; dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match); return dev ? to_platform_device(dev) : NULL; }

Contributors

PersonTokensPropCommitsCommitProp
jonas bonnjonas bonn41100.00%1100.00%
Total41100.00%1100.00%

EXPORT_SYMBOL(of_find_device_by_node); #ifdef CONFIG_OF_ADDRESS /* * The following routines scan a subtree and registers a device for * each applicable node. * * Note: sparc doesn't use these routines because it has a different * mechanism for creating devices from device tree nodes. */ /** * of_device_make_bus_id - Use the device node data to assign a unique name * @dev: pointer to device structure that is linked to a device tree node * * This routine will first try using the translated bus address to * derive a unique name. If it cannot, then it will prepend names from * parent nodes until a unique name can be derived. */
void of_device_make_bus_id(struct device *dev) { struct device_node *node = dev->of_node; const __be32 *reg; u64 addr; /* Construct the name, using parent nodes if necessary to ensure uniqueness */ while (node->parent) { /* * If the address can be translated, then that is as much * uniqueness as we need. Make it the first component and return */ reg = of_get_property(node, "reg", NULL); if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) { dev_set_name(dev, dev_name(dev) ? "%llx.%s:%s" : "%llx.%s", (unsigned long long)addr, node->name, dev_name(dev)); return; } /* format arguments only used if dev_name() resolves to NULL */ dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s", strrchr(node->full_name, '/') + 1, dev_name(dev)); node = node->parent; } }

Contributors

PersonTokensPropCommitsCommitProp
grant likelygrant likely13499.26%266.67%
kim phillipskim phillips10.74%133.33%
Total135100.00%3100.00%

/** * 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); } if (of_irq_to_resource_table(np, res, num_irq) != num_irq) pr_debug("not all legacy IRQ resources mapped for %s\n", np->name); } dev->dev.of_node = of_node_get(np); dev->dev.parent = parent ? : &platform_bus; if (bus_id) dev_set_name(&dev->dev, "%s", bus_id); else of_device_make_bus_id(&dev->dev); return dev; }

Contributors

PersonTokensPropCommitsCommitProp
grant likelygrant likely23492.86%571.43%
rob herringrob herring103.97%114.29%
andres salomonandres salomon83.17%114.29%
Total252100.00%7100.00%

EXPORT_SYMBOL(of_device_alloc);
static void of_dma_deconfigure(struct device *dev) { arch_teardown_dma_ops(dev); }

Contributors

PersonTokensPropCommitsCommitProp
will deaconwill deacon16100.00%1100.00%
Total16100.00%1100.00%

/** * of_platform_device_create_pdata - Alloc, initialize and register an of_device * @np: pointer to node to create device for * @bus_id: name to assign device * @platform_data: pointer to populate platform_data pointer with * @parent: Linux device model parent device. * * Returns pointer to created platform device, or NULL if a device was not * registered. Unavailable devices will not get registered. */
static struct platform_device *of_platform_device_create_pdata( struct device_node *np, const char *bus_id, void *platform_data, struct device *parent) { struct platform_device *dev; if (!of_device_is_available(np) || of_node_test_and_set_flag(np, OF_POPULATED)) return NULL; dev = of_device_alloc(np, bus_id, parent); if (!dev) goto err_clear_flag; dev->dev.bus = &platform_bus_type; dev->dev.platform_data = platform_data; of_dma_configure(&dev->dev, dev->dev.of_node); of_msi_configure(&dev->dev, dev->dev.of_node); if (of_device_add(dev) != 0) { of_dma_deconfigure(&dev->dev); platform_device_put(dev); goto err_clear_flag; } return dev; err_clear_flag: of_node_clear_flag(np, OF_POPULATED); return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
grant likelygrant likely9460.26%654.55%
pawel mollpawel moll2516.03%19.09%
will deaconwill deacon1610.26%19.09%
marc zyngiermarc zyngier148.97%19.09%
murali karicherimurali karicheri63.85%19.09%
mark brownmark brown10.64%19.09%
Total156100.00%11100.00%

/** * of_platform_device_create - Alloc, initialize and register an of_device * @np: pointer to node to create device for * @bus_id: name to assign device * @parent: Linux device model parent device. * * Returns pointer to created platform device, or NULL if a device was not * registered. Unavailable devices will not get registered. */
struct platform_device *of_platform_device_create(struct device_node *np, const char *bus_id, struct device *parent) { return of_platform_device_create_pdata(np, bus_id, NULL, parent); }

Contributors

PersonTokensPropCommitsCommitProp
grant likelygrant likely34100.00%1100.00%
Total34100.00%1100.00%

EXPORT_SYMBOL(of_platform_device_create); #ifdef CONFIG_ARM_AMBA
static struct amba_device *of_amba_device_create(struct device_node *node, const char *bus_id, void *platform_data, struct device *parent) { struct amba_device *dev; const void *prop; int i, ret; pr_debug("Creating amba device %s\n", node->full_name); if (!of_device_is_available(node) || of_node_test_and_set_flag(node, OF_POPULATED)) return NULL; dev = amba_device_alloc(NULL, 0, 0); if (!dev) { pr_err("%s(): amba_device_alloc() failed for %s\n", __func__, node->full_name); goto err_clear_flag; } /* setup generic device info */ dev->dev.of_node = of_node_get(node); dev->dev.parent = parent ? : &platform_bus; dev->dev.platform_data = platform_data; if (bus_id) dev_set_name(&dev->dev, "%s", bus_id); else of_device_make_bus_id(&dev->dev); of_dma_configure(&dev->dev, dev->dev.of_node); /* Allow the HW Peripheral ID to be overridden */ prop = of_get_property(node, "arm,primecell-periphid", NULL); if (prop) dev->periphid = of_read_ulong(prop, 1); /* Decode the IRQs and address ranges */ for (i = 0; i < AMBA_NR_IRQS; i++) dev->irq[i] = irq_of_parse_and_map(node, i); ret = of_address_to_resource(node, 0, &dev->res); if (ret) { pr_err("%s(): of_address_to_resource() failed (%d) for %s\n", __func__, ret, node->full_name); goto err_free; } ret = amba_device_add(dev, &iomem_resource); if (ret) { pr_err("%s(): amba_device_add() failed (%d) for %s\n", __func__, ret, node->full_name); goto err_free; } return dev; err_free: amba_device_put(dev); err_clear_flag: of_node_clear_flag(node, OF_POPULATED); return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
grant likelygrant likely23473.82%228.57%
bartlomiej zolnierkiewiczbartlomiej zolnierkiewicz4313.56%114.29%
pawel mollpawel moll195.99%114.29%
robin murphyrobin murphy82.52%114.29%
russell kingrussell king72.21%114.29%
murali karicherimurali karicheri61.89%114.29%
Total317100.00%7100.00%

#else /* CONFIG_ARM_AMBA */
static struct amba_device *of_amba_device_create(struct device_node *node, const char *bus_id, void *platform_data, struct device *parent) { return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
grant likelygrant likely30100.00%1100.00%
Total30100.00%1100.00%

#endif /* CONFIG_ARM_AMBA */ /** * of_devname_lookup() - Given a device node, lookup the preferred Linux name */
static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, struct device_node *np) { const struct of_dev_auxdata *auxdata; struct resource res; int compatible = 0; if (!lookup) return NULL; auxdata = lookup; for (; auxdata->compatible; auxdata++) { if (!of_device_is_compatible(np, auxdata->compatible)) continue; compatible++; if (!of_address_to_resource(np, 0, &res)) if (res.start != auxdata->phys_addr) continue; pr_debug("%s: devname=%s\n", np->full_name, auxdata->name); return auxdata; } if (!compatible) return NULL; /* Try compatible match if no phys_addr and name are specified */ auxdata = lookup; for (; auxdata->compatible; auxdata++) { if (!of_device_is_compatible(np, auxdata->compatible)) continue; if (!auxdata->phys_addr && !auxdata->name) { pr_debug("%s: compatible match\n", np->full_name); return auxdata; } } return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
grant likelygrant likely9049.45%240.00%
tony lindgrentony lindgren8747.80%120.00%
olof johanssonolof johansson42.20%120.00%
lee joneslee jones10.55%120.00%
Total182100.00%5100.00%

/** * of_platform_bus_create() - Create a device for a node and its children. * @bus: device node of the bus to instantiate * @matches: match table for bus nodes * @lookup: auxdata table for matching id and platform_data with device nodes * @parent: parent for new device, or NULL for top level. * @strict: require compatible property * * Creates a platform_device for the provided device_node, and optionally * recursively create devices for all the child nodes. */
static int of_platform_bus_create(struct device_node *bus, const struct of_device_id *matches, const struct of_dev_auxdata *lookup, struct device *parent, bool strict) { const struct of_dev_auxdata *auxdata; struct device_node *child; struct platform_device *dev; const char *bus_id = NULL; void *platform_data = NULL; int rc = 0; /* Make sure it has a compatible property */ if (strict && (!of_get_property(bus, "compatible", NULL))) { pr_debug("%s() - skipping %s, no compatible prop\n", __func__, bus->full_name); return 0; } auxdata = of_dev_lookup(lookup, bus); if (auxdata) { bus_id = auxdata->name; platform_data = auxdata->platform_data; } if (of_device_is_compatible(bus, "arm,primecell")) { /* * Don't return an error here to keep compatibility with older * device tree files. */ of_amba_device_create(bus, bus_id, platform_data, parent); return 0; } dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); if (!dev || !of_match_node(matches, bus)) return 0; for_each_child_of_node(bus, child) { pr_debug(" create child: %s\n", child->full_name); rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); if (rc) { of_node_put(child); break; } } of_node_set_flag(bus, OF_POPULATED_BUS); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
grant likelygrant likely23699.58%787.50%
bartlomiej zolnierkiewiczbartlomiej zolnierkiewicz10.42%112.50%
Total237100.00%8100.00%

/** * of_platform_bus_probe() - Probe the device-tree for platform buses * @root: parent of the first level to probe or NULL for the root of the tree * @matches: match table for bus nodes * @parent: parent to hook devices from, NULL for toplevel * * Note that children of the provided root are not instantiated as devices * unless the specified root itself matches the bus list and is not NULL. */
int of_platform_bus_probe(struct device_node *root, const struct of_device_id *matches, struct device *parent) { struct device_node *child; int rc = 0; root = root ? of_node_get(root) : of_find_node_by_path("/"); if (!root) return -EINVAL; pr_debug("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)) { rc = of_platform_bus_create(root, matches, NULL, parent, false); } else for_each_child_of_node(root, child) { if (!of_match_node(matches, child)) continue; rc = of_platform_bus_create(child, matches, NULL, parent, false); if (rc) { of_node_put(child); break; } } of_node_put(root); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
grant likelygrant likely14395.33%685.71%
julia lawalljulia lawall74.67%114.29%
Total150100.00%7100.00%

EXPORT_SYMBOL(of_platform_bus_probe); /** * of_platform_populate() - Populate platform_devices from device tree data * @root: parent of the first level to probe or NULL for the root of the tree * @matches: match table, NULL to use the default * @lookup: auxdata table for matching id and platform_data with device nodes * @parent: parent to hook devices from, NULL for toplevel * * Similar to of_platform_bus_probe(), this function walks the device tree * and creates devices from nodes. It differs in that it follows the modern * convention of requiring all device nodes to have a 'compatible' property, * and it is suitable for creating devices which are children of the root * node (of_platform_bus_probe will only create children of the root which * are selected by the @matches argument). * * New board support should be using this function instead of * of_platform_bus_probe(). * * Returns 0 on success, < 0 on failure. */
int of_platform_populate(struct device_node *root, const struct of_device_id *matches, const struct of_dev_auxdata *lookup, struct device *parent) { struct device_node *child; int rc = 0; root = root ? of_node_get(root) : of_find_node_by_path("/"); if (!root) return -EINVAL; for_each_child_of_node(root, child) { rc = of_platform_bus_create(child, matches, lookup, parent, true); if (rc) { of_node_put(child); break; } } of_node_set_flag(root, OF_POPULATED_BUS); of_node_put(root); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
grant likelygrant likely10393.64%375.00%
julia lawalljulia lawall76.36%125.00%
Total110100.00%4100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
hauke mehrtenshauke mehrtens33100.00%1100.00%
Total33100.00%1100.00%

EXPORT_SYMBOL_GPL(of_platform_default_populate);
static 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); 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 of_dma_deconfigure(dev); of_node_clear_flag(dev->of_node, OF_POPULATED); of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
pawel mollpawel moll9577.24%133.33%
grant likelygrant likely2318.70%133.33%
will deaconwill deacon54.07%133.33%
Total123100.00%3100.00%

/** * 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). * * Returns 0 when all children devices have been removed or * -EBUSY when some children remained. */
void of_platform_depopulate(struct device *parent) { if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) { device_for_each_child(parent, NULL, of_platform_device_destroy); of_node_clear_flag(parent->of_node, OF_POPULATED_BUS); } }

Contributors

PersonTokensPropCommitsCommitProp
grant likelygrant likely2862.22%266.67%
pawel mollpawel moll1737.78%133.33%
Total45100.00%3100.00%

EXPORT_SYMBOL_GPL(of_platform_depopulate); #ifdef CONFIG_OF_DYNAMIC
static int of_platform_notify(struct notifier_block *nb, unsigned long action, void *arg) { struct of_reconfig_data *rd = arg; struct platform_device *pdev_parent, *pdev; bool children_left; switch (of_reconfig_get_state_change(action, rd)) { case OF_RECONFIG_CHANGE_ADD: /* verify that the parent is a bus */ if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS)) return NOTIFY_OK; /* not for us */ /* already populated? (driver using of_populate manually) */ if (of_node_check_flag(rd->dn, OF_POPULATED)) return NOTIFY_OK; /* pdev_parent may be NULL when no bus platform device */ pdev_parent = of_find_device_by_node(rd->dn->parent); pdev = of_platform_device_create(rd->dn, NULL, pdev_parent ? &pdev_parent->dev : NULL); of_dev_put(pdev_parent); if (pdev == NULL) { pr_err("%s: failed to create for '%s'\n", __func__, rd->dn->full_name); /* of_platform_device_create tosses the error code */ return notifier_from_errno(-EINVAL); } break; case OF_RECONFIG_CHANGE_REMOVE: /* already depopulated? */ if (!of_node_check_flag(rd->dn, OF_POPULATED)) return NOTIFY_OK; /* find our device by node */ pdev = of_find_device_by_node(rd->dn); if (pdev == NULL) return NOTIFY_OK; /* no? not meant for us */ /* unregister takes one ref away */ of_platform_device_destroy(&pdev->dev, &children_left); /* and put the reference of the find */ of_dev_put(pdev); break; } return NOTIFY_OK; }

Contributors

PersonTokensPropCommitsCommitProp
pantelis antonioupantelis antoniou213100.00%2100.00%
Total213100.00%2100.00%

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)); }

Contributors

PersonTokensPropCommitsCommitProp
pantelis antonioupantelis antoniou16100.00%1100.00%
Total16100.00%1100.00%

#endif /* CONFIG_OF_DYNAMIC */ #endif /* CONFIG_OF_ADDRESS */

Overall Contributors

PersonTokensPropCommitsCommitProp
grant likelygrant likely147064.81%2245.83%
pantelis antonioupantelis antoniou24710.89%24.17%
pawel mollpawel moll1617.10%12.08%
tony lindgrentony lindgren873.84%12.08%
jonas bonnjonas bonn693.04%12.08%
bartlomiej zolnierkiewiczbartlomiej zolnierkiewicz441.94%12.08%
hauke mehrtenshauke mehrtens381.68%12.08%
will deaconwill deacon371.63%24.17%
stephen rothwellstephen rothwell160.71%24.17%
julia lawalljulia lawall140.62%12.08%
marc zyngiermarc zyngier140.62%12.08%
murali karicherimurali karicheri120.53%12.08%
rob herringrob herring100.44%12.08%
robin murphyrobin murphy80.35%12.08%
andres salomonandres salomon80.35%12.08%
linus walleijlinus walleij70.31%12.08%
russell kingrussell king70.31%12.08%
olof johanssonolof johansson50.22%12.08%
stephen warrenstephen warren50.22%12.08%
masahiro yamadamasahiro yamada50.22%12.08%
kim phillipskim phillips10.04%12.08%
javi merinojavi merino10.04%12.08%
lee joneslee jones10.04%12.08%
mark brownmark brown10.04%12.08%
Total2268100.00%48100.00%
Directory: drivers/of
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
{% endraw %}