diff options
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/Kconfig | 3 | ||||
| -rw-r--r-- | drivers/of/Makefile | 2 | ||||
| -rw-r--r-- | drivers/of/base.c | 275 | ||||
| -rw-r--r-- | drivers/of/device.c | 131 | ||||
| -rw-r--r-- | drivers/of/platform.c | 96 |
5 files changed, 507 insertions, 0 deletions
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig new file mode 100644 index 00000000000..c03072b12f4 --- /dev/null +++ b/drivers/of/Kconfig @@ -0,0 +1,3 @@ +config OF_DEVICE + def_bool y + depends on OF && (SPARC || PPC_OF) diff --git a/drivers/of/Makefile b/drivers/of/Makefile new file mode 100644 index 00000000000..ab9be5d5255 --- /dev/null +++ b/drivers/of/Makefile @@ -0,0 +1,2 @@ +obj-y = base.o +obj-$(CONFIG_OF_DEVICE) += device.o platform.o diff --git a/drivers/of/base.c b/drivers/of/base.c new file mode 100644 index 00000000000..9377f3bc410 --- /dev/null +++ b/drivers/of/base.c @@ -0,0 +1,275 @@ +/* + * Procedures for creating, accessing and interpreting the device tree. + * + * Paul Mackerras August 1996. + * Copyright (C) 1996-2005 Paul Mackerras. + * + * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. + * {engebret|bergner}@us.ibm.com + * + * Adapted for sparc and sparc64 by David S. Miller davem@davemloft.net + * + * Reconsolidated from arch/x/kernel/prom.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/module.h> +#include <linux/of.h> +#include <linux/spinlock.h> + +struct device_node *allnodes; + +/* use when traversing tree through the allnext, child, sibling, + * or parent members of struct device_node. + */ +DEFINE_RWLOCK(devtree_lock); + +int of_n_addr_cells(struct device_node *np) +{ + const int *ip; + + do { + if (np->parent) + np = np->parent; + ip = of_get_property(np, "#address-cells", NULL); + if (ip) + return *ip; + } while (np->parent); + /* No #address-cells property for the root node */ + return OF_ROOT_NODE_ADDR_CELLS_DEFAULT; +} +EXPORT_SYMBOL(of_n_addr_cells); + +int of_n_size_cells(struct device_node *np) +{ + const int *ip; + + do { + if (np->parent) + np = np->parent; + ip = of_get_property(np, "#size-cells", NULL); + if (ip) + return *ip; + } while (np->parent); + /* No #size-cells property for the root node */ + return OF_ROOT_NODE_SIZE_CELLS_DEFAULT; +} +EXPORT_SYMBOL(of_n_size_cells); + +struct property *of_find_property(const struct device_node *np, + const char *name, + int *lenp) +{ + struct property *pp; + + read_lock(&devtree_lock); + for (pp = np->properties; pp != 0; pp = pp->next) { + if (of_prop_cmp(pp->name, name) == 0) { + if (lenp != 0) + *lenp = pp->length; + break; + } + } + read_unlock(&devtree_lock); + + return pp; +} +EXPORT_SYMBOL(of_find_property); + +/* + * Find a property with a given name for a given node + * and return the value. + */ +const void *of_get_property(const struct device_node *np, const char *name, + int *lenp) +{ + struct property *pp = of_find_property(np, name, lenp); + + return pp ? pp->value : NULL; +} +EXPORT_SYMBOL(of_get_property); + +/** Checks if the given "compat" string matches one of the strings in + * the device's "compatible" property + */ +int of_device_is_compatible(const struct device_node *device, + const char *compat) +{ + const char* cp; + int cplen, l; + + cp = of_get_property(device, "compatible", &cplen); + if (cp == NULL) + return 0; + while (cplen > 0) { + if (of_compat_cmp(cp, compat, strlen(compat)) == 0) + return 1; + l = strlen(cp) + 1; + cp += l; + cplen -= l; + } + + return 0; +} +EXPORT_SYMBOL(of_device_is_compatible); + +/** + * of_get_parent - Get a node's parent if any + * @node: Node to get parent + * + * Returns a node pointer with refcount incremented, use + * of_node_put() on it when done. + */ +struct device_node *of_get_parent(const struct device_node *node) +{ + struct device_node *np; + + if (!node) + return NULL; + + read_lock(&devtree_lock); + np = of_node_get(node->parent); + read_unlock(&devtree_lock); + return np; +} +EXPORT_SYMBOL(of_get_parent); + +/** + * of_get_next_child - Iterate a node childs + * @node: parent node + * @prev: previous child of the parent node, or NULL to get first + * + * Returns a node pointer with refcount incremented, use + * of_node_put() on it when done. + */ +struct device_node *of_get_next_child(const struct device_node *node, + struct device_node *prev) +{ + struct device_node *next; + + read_lock(&devtree_lock); + next = prev ? prev->sibling : node->child; + for (; next; next = next->sibling) + if (of_node_get(next)) + break; + of_node_put(prev); + read_unlock(&devtree_lock); + return next; +} +EXPORT_SYMBOL(of_get_next_child); + +/** + * of_find_node_by_path - Find a node matching a full OF path + * @path: The full path to match + * + * Returns a node pointer with refcount incremented, use + * of_node_put() on it when done. + */ +struct device_node *of_find_node_by_path(const char *path) +{ + struct device_node *np = allnodes; + + read_lock(&devtree_lock); + for (; np; np = np->allnext) { + if (np->full_name && (of_node_cmp(np->full_name, path) == 0) + && of_node_get(np)) + break; + } + read_unlock(&devtree_lock); + return np; +} +EXPORT_SYMBOL(of_find_node_by_path); + +/** + * of_find_node_by_name - Find a node by its "name" property + * @from: The node to start searching from or NULL, the node + * you pass will not be searched, only the next one + * will; typically, you pass what the previous call + * returned. of_node_put() will be called on it + * @name: The name string to match against + * + * Returns a node pointer with refcount incremented, use + * of_node_put() on it when done. + */ +struct device_node *of_find_node_by_name(struct device_node *from, + const char *name) +{ + struct device_node *np; + + read_lock(&devtree_lock); + np = from ? from->allnext : allnodes; + for (; np; np = np->allnext) + if (np->name && (of_node_cmp(np->name, name) == 0) + && of_node_get(np)) + break; + of_node_put(from); + read_unlock(&devtree_lock); + return np; +} +EXPORT_SYMBOL(of_find_node_by_name); + +/** + * of_find_node_by_type - Find a node by its "device_type" property + * @from: The node to start searching from, or NULL to start searching + * the entire device tree. The node you pass will not be + * searched, only the next one will; typically, you pass + * what the previous call returned. of_node_put() will be + * called on from for you. + * @type: The type string to match against + * + * Returns a node pointer with refcount incremented, use + * of_node_put() on it when done. + */ +struct device_node *of_find_node_by_type(struct device_node *from, + const char *type) +{ + struct device_node *np; + + read_lock(&devtree_lock); + np = from ? from->allnext : allnodes; + for (; np; np = np->allnext) + if (np->type && (of_node_cmp(np->type, type) == 0) + && of_node_get(np)) + break; + of_node_put(from); + read_unlock(&devtree_lock); + return np; +} +EXPORT_SYMBOL(of_find_node_by_type); + +/** + * of_find_compatible_node - Find a node based on type and one of the + * tokens in its "compatible" property + * @from: The node to start searching from or NULL, the node + * you pass will not be searched, only the next one + * will; typically, you pass what the previous call + * returned. of_node_put() will be called on it + * @type: The type string to match "device_type" or NULL to ignore + * @compatible: The string to match to one of the tokens in the device + * "compatible" list. + * + * Returns a node pointer with refcount incremented, use + * of_node_put() on it when done. + */ +struct device_node *of_find_compatible_node(struct device_node *from, + const char *type, const char *compatible) +{ + struct device_node *np; + + read_lock(&devtree_lock); + np = from ? from->allnext : allnodes; + for (; np; np = np->allnext) { + if (type + && !(np->type && (of_node_cmp(np->type, type) == 0))) + continue; + if (of_device_is_compatible(np, compatible) && of_node_get(np)) + break; + } + of_node_put(from); + read_unlock(&devtree_lock); + return np; +} +EXPORT_SYMBOL(of_find_compatible_node); diff --git a/drivers/of/device.c b/drivers/of/device.c new file mode 100644 index 00000000000..6245f060fb7 --- /dev/null +++ b/drivers/of/device.c @@ -0,0 +1,131 @@ +#include <linux/string.h> +#include <linux/kernel.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/slab.h> + +#include <asm/errno.h> + +/** + * of_match_node - Tell if an device_node has a matching of_match structure + * @ids: array of of device match structures to search in + * @node: the of device structure to match against + * + * Low level utility function used by device matching. + */ +const struct of_device_id *of_match_node(const struct of_device_id *matches, + const struct device_node *node) +{ + while (matches->name[0] || matches->type[0] || matches->compatible[0]) { + int match = 1; + if (matches->name[0]) + match &= node->name + && !strcmp(matches->name, node->name); + if (matches->type[0]) + match &= node->type + && !strcmp(matches->type, node->type); + if (matches->compatible[0]) + match &= of_device_is_compatible(node, + matches->compatible); + if (match) + return matches; + matches++; + } + return NULL; +} +EXPORT_SYMBOL(of_match_node); + +/** + * of_match_device - Tell if an of_device structure has a matching + * of_match structure + * @ids: array of of device match structures to search in + * @dev: the of device structure to match against + * + * Used by a driver to check whether an of_device present in the + * system is in its list of supported devices. + */ +const struct of_device_id *of_match_device(const struct of_device_id *matches, + const struct of_device *dev) +{ + if (!dev->node) + return NULL; + return of_match_node(matches, dev->node); +} +EXPORT_SYMBOL(of_match_device); + +struct of_device *of_dev_get(struct of_device *dev) +{ + struct device *tmp; + + if (!dev) + return NULL; + tmp = get_device(&dev->dev); + if (tmp) + return to_of_device(tmp); + else + return NULL; +} +EXPORT_SYMBOL(of_dev_get); + +void of_dev_put(struct of_device *dev) +{ + if (dev) + put_device(&dev->dev); +} +EXPORT_SYMBOL(of_dev_put); + +static ssize_t dev_show_devspec(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct of_device *ofdev; + + ofdev = to_of_device(dev); + return sprintf(buf, "%s", ofdev->node->full_name); +} + +static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL); + +/** + * of_release_dev - free an of device structure when all users of it are finished. + * @dev: device that's been disconnected + * + * Will be called only by the device core when all users of this of device are + * done. + */ +void of_release_dev(struct device *dev) +{ + struct of_device *ofdev; + + ofdev = to_of_device(dev); + of_node_put(ofdev->node); + kfree(ofdev); +} +EXPORT_SYMBOL(of_release_dev); + +int of_device_register(struct of_device *ofdev) +{ + int rc; + + BUG_ON(ofdev->node == NULL); + + rc = device_register(&ofdev->dev); + if (rc) + return rc; + + rc = device_create_file(&ofdev->dev, &dev_attr_devspec); + if (rc) + device_unregister(&ofdev->dev); + + return rc; +} +EXPORT_SYMBOL(of_device_register); + +void of_device_unregister(struct of_device *ofdev) +{ + device_remove_file(&ofdev->dev, &dev_attr_devspec); + device_unregister(&ofdev->dev); +} +EXPORT_SYMBOL(of_device_unregister); diff --git a/drivers/of/platform.c b/drivers/of/platform.c new file mode 100644 index 00000000000..864f09fd9f8 --- /dev/null +++ b/drivers/of/platform.c @@ -0,0 +1,96 @@ +/* + * 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/device.h> +#include <linux/of_device.h> +#include <linux/of_platform.h> + +static int of_platform_bus_match(struct device *dev, struct device_driver *drv) +{ + struct of_device *of_dev = to_of_device(dev); + struct of_platform_driver *of_drv = to_of_platform_driver(drv); + const struct of_device_id *matches = of_drv->match_table; + + if (!matches) + return 0; + + return of_match_device(matches, of_dev) != NULL; +} + +static int of_platform_device_probe(struct device *dev) +{ + int error = -ENODEV; + struct of_platform_driver *drv; + struct of_device *of_dev; + const struct of_device_id *match; + + drv = to_of_platform_driver(dev->driver); + of_dev = to_of_device(dev); + + if (!drv->probe) + return error; + + of_dev_get(of_dev); + + match = of_match_device(drv->match_table, of_dev); + if (match) + error = drv->probe(of_dev, match); + if (error) + of_dev_put(of_dev); + + return error; +} + +static int of_platform_device_remove(struct device *dev) +{ + struct of_device *of_dev = to_of_device(dev); + struct of_platform_driver *drv = to_of_platform_driver(dev->driver); + + if (dev->driver && drv->remove) + drv->remove(of_dev); + return 0; +} + +static int of_platform_device_suspend(struct device *dev, pm_message_t state) +{ + struct of_device *of_dev = to_of_device(dev); + struct of_platform_driver *drv = to_of_platform_driver(dev->driver); + int error = 0; + + if (dev->driver && drv->suspend) + error = drv->suspend(of_dev, state); + return error; +} + +static int of_platform_device_resume(struct device * dev) +{ + struct of_device *of_dev = to_of_device(dev); + struct of_platform_driver *drv = to_of_platform_driver(dev->driver); + int error = 0; + + if (dev->driver && drv->resume) + error = drv->resume(of_dev); + return error; +} + +int of_bus_type_init(struct bus_type *bus, const char *name) +{ + bus->name = name; + bus->match = of_platform_bus_match; + bus->probe = of_platform_device_probe; + bus->remove = of_platform_device_remove; + bus->suspend = of_platform_device_suspend; + bus->resume = of_platform_device_resume; + return bus_register(bus); +} |