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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#define pr_fmt(fmt) "OF: " fmt
#include <linux/errno.h>#include <linux/module.h>#include <linux/amba/bus.h>#include <linux/device.h>#include <linux/dma-mapping.h>#include <linux/slab.h>#include <linux/of_address.h>#include <linux/of_device.h>#include <linux/of_irq.h>#include <linux/of_platform.h>#include <linux/platform_device.h>#include <linux/sysfb.h>
#include "of_private.h"
/** * of_find_device_by_node - Find the platform_device associated with a node * @np: Pointer to device tree node * * Takes a reference to the embedded struct device which needs to be dropped * after use. * * Return: platform_device pointer, or NULL if not found */struct platform_device *of_find_device_by_node(struct device_node *np){ struct device *dev;
dev = bus_find_device_by_of_node(&platform_bus_type, np); return dev ? to_platform_device(dev) : NULL;}EXPORT_SYMBOL(of_find_device_by_node);
int of_device_add(struct platform_device *ofdev){ BUG_ON(ofdev->dev.of_node == NULL);
/* name and id have to be set so that the platform bus doesn't get * confused on matching */ ofdev->name = dev_name(&ofdev->dev); ofdev->id = PLATFORM_DEVID_NONE;
/* * If this device has not binding numa node in devicetree, that is * of_node_to_nid returns NUMA_NO_NODE. device_add will assume that this * device is on the same node as the parent. */ set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
return device_add(&ofdev->dev);}
int of_device_register(struct platform_device *pdev){ device_initialize(&pdev->dev); return of_device_add(pdev);}EXPORT_SYMBOL(of_device_register);
void of_device_unregister(struct platform_device *ofdev){ device_unregister(&ofdev->dev);}EXPORT_SYMBOL(of_device_unregister);
#ifdef CONFIG_OF_ADDRESSstatic const struct of_device_id of_skipped_node_table[] = { { .compatible = "operating-points-v2", }, {} /* Empty terminated list */};
/* * 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_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; struct resource *res;
dev = platform_device_alloc("", PLATFORM_DEVID_NONE); if (!dev) return NULL;
/* count the io resources */ num_reg = of_address_count(np);
/* Populate the resource table */ if (num_reg) { res = kzalloc_objs(*res, num_reg); if (!res) { platform_device_put(dev); return NULL; }
dev->num_resources = num_reg; dev->resource = res; for (i = 0; i < num_reg; i++, res++) { rc = of_address_to_resource(np, i, res); WARN_ON(rc); } }
/* setup generic device info */ platform_device_set_of_node(dev, 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;}EXPORT_SYMBOL(of_device_alloc);
/** * of_platform_device_create_pdata - Alloc, initialize and register an of_device * @np: pointer to node to create device for * @bus_id: name to assign device * @platform_data: pointer to populate platform_data pointer with * @parent: Linux device model parent device. * * Return: 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;
pr_debug("create platform device: %pOF\n", np);
if (!of_device_is_available(np) || of_node_test_and_set_flag(np, OF_POPULATED)) return NULL;
dev = of_device_alloc(np, bus_id, parent); if (!dev) goto err_clear_flag;
dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); if (!dev->dev.dma_mask) dev->dev.dma_mask = &dev->dev.coherent_dma_mask; dev->dev.bus = &platform_bus_type; dev->dev.platform_data = platform_data; of_msi_configure(&dev->dev, dev->dev.of_node);
if (of_device_add(dev) != 0) { platform_device_put(dev); goto err_clear_flag; }
return dev;
err_clear_flag: of_node_clear_flag(np, OF_POPULATED); return NULL;}
/** * of_platform_device_create - Alloc, initialize and register an of_device * @np: pointer to node to create device for * @bus_id: name to assign device * @parent: Linux device model parent device. * * Return: Pointer to created platform device, or NULL if a device was not * registered. Unavailable devices will not get registered. */struct platform_device *of_platform_device_create(struct device_node *np, const char *bus_id, struct device *parent){ return of_platform_device_create_pdata(np, bus_id, NULL, parent);}EXPORT_SYMBOL(of_platform_device_create);
#ifdef CONFIG_ARM_AMBAstatic 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; int ret;
pr_debug("Creating amba device %pOF\n", node);
if (!of_device_is_available(node) || of_node_test_and_set_flag(node, OF_POPULATED)) return NULL;
dev = amba_device_alloc(NULL, 0, 0); if (!dev) goto err_clear_flag;
/* AMBA devices only support a single DMA mask */ dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
/* setup generic device info */ device_set_node(&dev->dev, of_fwnode_handle(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);
/* Allow the HW Peripheral ID to be overridden */ of_property_read_u32(node, "arm,primecell-periphid", &dev->periphid);
ret = of_address_to_resource(node, 0, &dev->res); if (ret) { pr_err("amba: of_address_to_resource() failed (%d) for %pOF\n", ret, node); goto err_free; }
ret = amba_device_add(dev, &iomem_resource); if (ret) { pr_err("amba_device_add() failed (%d) for %pOF\n", ret, node); goto err_free; }
return dev;
err_free: amba_device_put(dev);err_clear_flag: of_node_clear_flag(node, OF_POPULATED); return NULL;}#else /* CONFIG_ARM_AMBA */static struct amba_device *of_amba_device_create(struct device_node *node, const char *bus_id, void *platform_data, struct device *parent){ return NULL;}#endif /* CONFIG_ARM_AMBA */
/* * of_dev_lookup() - Given a device node, lookup the preferred Linux name */static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, struct device_node *np){ const struct of_dev_auxdata *auxdata; struct resource res; int compatible = 0;
if (!lookup) return NULL;
auxdata = lookup; for (; auxdata->compatible; auxdata++) { if (!of_device_is_compatible(np, auxdata->compatible)) continue; compatible++; if (!of_address_to_resource(np, 0, &res)) if (res.start != auxdata->phys_addr) continue; pr_debug("%pOF: devname=%s\n", np, auxdata->name); return auxdata; }
if (!compatible) return NULL;
/* Try compatible match if no phys_addr and name are specified */ auxdata = lookup; for (; auxdata->compatible; auxdata++) { if (!of_device_is_compatible(np, auxdata->compatible)) continue; if (!auxdata->phys_addr && !auxdata->name) { pr_debug("%pOF: compatible match\n", np); return auxdata; } }
return NULL;}
/** * of_platform_bus_create() - Create a device for a node and its children. * @bus: device node of the bus to instantiate * @matches: match table for bus nodes * @lookup: auxdata table for matching id and platform_data with device nodes * @parent: parent for new device, or NULL for top level. * @strict: require compatible property * * Creates a platform_device for the provided device_node, and optionally * recursively create devices for all the child nodes. */static int of_platform_bus_create(struct device_node *bus, const struct of_device_id *matches, const struct of_dev_auxdata *lookup, struct device *parent, bool strict){ const struct of_dev_auxdata *auxdata; struct 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_property_present(bus, "compatible"))) { pr_debug("%s() - skipping %pOF, no compatible prop\n", __func__, bus); return 0; }
/* Skip nodes for which we don't want to create devices */ if (unlikely(of_match_node(of_skipped_node_table, bus))) { pr_debug("%s() - skipping %pOF node\n", __func__, bus); return 0; }
if (of_node_check_flag(bus, OF_POPULATED_BUS)) { pr_debug("%s() - skipping %pOF, already populated\n", __func__, bus); return 0; }
auxdata = of_dev_lookup(lookup, bus); if (auxdata) { bus_id = auxdata->name; platform_data = auxdata->platform_data; }
if (of_device_is_compatible(bus, "arm,primecell")) { /* * Don't return an error here to keep compatibility with older * device tree files. */ of_amba_device_create(bus, bus_id, platform_data, parent); return 0; }
dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); if (!dev || !of_match_node(matches, bus)) return 0;
for_each_child_of_node_scoped(bus, child) { pr_debug(" create child: %pOF\n", child); rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); if (rc) break; } of_node_set_flag(bus, OF_POPULATED_BUS); return rc;}
/** * of_platform_bus_probe() - Probe the device-tree for platform buses * @root: parent of the first level to probe or NULL for the root of the tree * @matches: match table for bus nodes * @parent: parent to hook devices from, NULL for toplevel * * Note that children of the provided root are not instantiated as devices * unless the specified root itself matches the bus list and is not NULL. */int of_platform_bus_probe(struct device_node *root, const struct of_device_id *matches, struct device *parent){ int rc = 0;
root = root ? of_node_get(root) : of_find_node_by_path("/"); if (!root) return -EINVAL;
pr_debug("%s()\n", __func__); pr_debug(" starting at: %pOF\n", root);
/* Do a self check of bus type, if there's a match, create children */ if (of_match_node(matches, root)) { rc = of_platform_bus_create(root, matches, NULL, parent, false); } else { for_each_child_of_node_scoped(root, child) { if (!of_match_node(matches, child)) continue; rc = of_platform_bus_create(child, matches, NULL, parent, false); if (rc) break; } }
of_node_put(root); return rc;}EXPORT_SYMBOL(of_platform_bus_probe);
/** * of_platform_populate() - Populate platform_devices from device tree data * @root: parent of the first level to probe or NULL for the root of the tree * @matches: match table, NULL to use the default * @lookup: auxdata table for matching id and platform_data with device nodes * @parent: parent to hook devices from, NULL for toplevel * * Similar to of_platform_bus_probe(), this function walks the device tree * and creates devices from nodes. It differs in that it follows the modern * convention of requiring all device nodes to have a 'compatible' property, * and it is suitable for creating devices which are children of the root * node (of_platform_bus_probe will only create children of the root which * are selected by the @matches argument). * * New board support should be using this function instead of * of_platform_bus_probe(). * * Return: 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){ int rc = 0;
root = root ? of_node_get(root) : of_find_node_by_path("/"); if (!root) return -EINVAL;
pr_debug("%s()\n", __func__); pr_debug(" starting at: %pOF\n", root);
device_links_supplier_sync_state_pause(); for_each_child_of_node_scoped(root, child) { rc = of_platform_bus_create(child, matches, lookup, parent, true); if (rc) break; } device_links_supplier_sync_state_resume();
of_node_set_flag(root, OF_POPULATED_BUS);
of_node_put(root); return rc;}EXPORT_SYMBOL_GPL(of_platform_populate);
int of_platform_default_populate(struct device_node *root, const struct of_dev_auxdata *lookup, struct device *parent){ static const struct of_device_id match_table[] = { { .compatible = "simple-bus", }, { .compatible = "simple-mfd", }, { .compatible = "isa", },#ifdef CONFIG_ARM_AMBA { .compatible = "arm,amba-bus", },#endif /* CONFIG_ARM_AMBA */ {} /* Empty terminated list */ };
return of_platform_populate(root, match_table, lookup, parent);}EXPORT_SYMBOL_GPL(of_platform_default_populate);
static const struct of_device_id reserved_mem_matches[] = { { .compatible = "phram" }, { .compatible = "qcom,rmtfs-mem" }, { .compatible = "qcom,cmd-db" }, { .compatible = "qcom,smem" }, { .compatible = "ramoops" }, { .compatible = "nvmem-rmem" }, { .compatible = "google,open-dice" }, {}};
static int __init of_platform_default_populate_init(void){ struct device_node *node, *reserved;
device_links_supplier_sync_state_pause();
if (IS_ENABLED(CONFIG_PPC)) { struct device_node *boot_display = NULL; struct platform_device *dev; int display_number = 0; int ret;
/* Check if we have a MacOS display without a node spec */ if (of_property_present(of_chosen, "linux,bootx-noscreen")) { /* * The old code tried to work out which node was the MacOS * display based on the address. I'm dropping that since the * lack of a node spec only happens with old BootX versions * (users can update) and with this code, they'll still get * a display (just not the palette hacks). */ dev = platform_device_alloc("bootx-noscreen", 0); if (WARN_ON(!dev)) return -ENOMEM; ret = platform_device_add(dev); if (WARN_ON(ret)) { platform_device_put(dev); return ret; } }
/* * For OF framebuffers, first create the device for the boot display, * then for the other framebuffers. Only fail for the boot display; * ignore errors for the rest. */ for_each_node_by_type(node, "display") { if (!of_property_read_bool(node, "linux,opened") || !of_property_read_bool(node, "linux,boot-display")) continue; dev = of_platform_device_create(node, "of-display", NULL); of_node_put(node); if (WARN_ON(!dev)) return -ENOMEM; boot_display = node; display_number++; break; } for_each_node_by_type(node, "display") { char buf[14]; const char *of_display_format = "of-display.%d";
if (!of_property_read_bool(node, "linux,opened") || node == boot_display) continue; ret = snprintf(buf, sizeof(buf), of_display_format, display_number++); if (ret < sizeof(buf)) of_platform_device_create(node, buf, NULL); }
} else { /* * Handle certain compatibles explicitly, since we don't want to create * platform_devices for every node in /reserved-memory with a * "compatible", */ reserved = of_find_node_by_path("/reserved-memory"); if (reserved) { for_each_child_of_node(reserved, node) { if (of_match_node(reserved_mem_matches, node)) of_platform_device_create(node, NULL, NULL); } of_node_put(reserved); }
node = of_find_node_by_path("/firmware"); if (node) { of_platform_default_populate(node, NULL, NULL); of_node_put(node); }
node = of_get_compatible_child(of_chosen, "simple-framebuffer"); if (node) { /* * Since a "simple-framebuffer" device is already added * here, disable the Generic System Framebuffers (sysfb) * to prevent it from registering another device for the * system framebuffer later (e.g: using the screen_info * data that may had been filled as well). * * This can happen for example on DT systems that do EFI * booting and may provide a GOP handle to the EFI stub. */ sysfb_disable(NULL); of_platform_device_create(node, 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);
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, recursively, 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, recursively, 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_DYNAMICstatic 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; struct device_node *parent;
switch (of_reconfig_get_state_change(action, rd)) { case OF_RECONFIG_CHANGE_ADD: parent = rd->dn->parent; /* verify that the parent is a bus (or the root node) */ if (!of_node_is_root(parent) && !of_node_check_flag(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(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 */