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- /*
- * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
- *
- * Based on the original work in Linux by
- * Copyright (c) 2006 SUSE Linux Products GmbH
- * Copyright (c) 2006 Tejun Heo <teheo@suse.de>
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
- #include <common.h>
- #include <linux/compat.h>
- #include <linux/kernel.h>
- #include <linux/list.h>
- #include <dm/device.h>
- /**
- * struct devres - Bookkeeping info for managed device resource
- * @entry: List to associate this structure with a device
- * @release: Callback invoked when this resource is released
- * @probe: Flag to show when this resource was allocated
- (true = probe, false = bind)
- * @name: Name of release function
- * @size: Size of resource data
- * @data: Resource data
- */
- struct devres {
- struct list_head entry;
- dr_release_t release;
- bool probe;
- #ifdef CONFIG_DEBUG_DEVRES
- const char *name;
- size_t size;
- #endif
- unsigned long long data[];
- };
- #ifdef CONFIG_DEBUG_DEVRES
- static void set_node_dbginfo(struct devres *dr, const char *name, size_t size)
- {
- dr->name = name;
- dr->size = size;
- }
- static void devres_log(struct udevice *dev, struct devres *dr,
- const char *op)
- {
- printf("%s: DEVRES %3s %p %s (%lu bytes)\n",
- dev->name, op, dr, dr->name, (unsigned long)dr->size);
- }
- #else /* CONFIG_DEBUG_DEVRES */
- #define set_node_dbginfo(dr, n, s) do {} while (0)
- #define devres_log(dev, dr, op) do {} while (0)
- #endif
- #if CONFIG_DEBUG_DEVRES
- void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
- const char *name)
- #else
- void *_devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
- #endif
- {
- size_t tot_size = sizeof(struct devres) + size;
- struct devres *dr;
- dr = kmalloc(tot_size, gfp);
- if (unlikely(!dr))
- return NULL;
- INIT_LIST_HEAD(&dr->entry);
- dr->release = release;
- set_node_dbginfo(dr, name, size);
- return dr->data;
- }
- void devres_free(void *res)
- {
- if (res) {
- struct devres *dr = container_of(res, struct devres, data);
- BUG_ON(!list_empty(&dr->entry));
- kfree(dr);
- }
- }
- void devres_add(struct udevice *dev, void *res)
- {
- struct devres *dr = container_of(res, struct devres, data);
- devres_log(dev, dr, "ADD");
- BUG_ON(!list_empty(&dr->entry));
- dr->probe = dev->flags & DM_FLAG_BOUND ? true : false;
- list_add_tail(&dr->entry, &dev->devres_head);
- }
- void *devres_find(struct udevice *dev, dr_release_t release,
- dr_match_t match, void *match_data)
- {
- struct devres *dr;
- list_for_each_entry_reverse(dr, &dev->devres_head, entry) {
- if (dr->release != release)
- continue;
- if (match && !match(dev, dr->data, match_data))
- continue;
- return dr->data;
- }
- return NULL;
- }
- void *devres_get(struct udevice *dev, void *new_res,
- dr_match_t match, void *match_data)
- {
- struct devres *new_dr = container_of(new_res, struct devres, data);
- void *res;
- res = devres_find(dev, new_dr->release, match, match_data);
- if (!res) {
- devres_add(dev, new_res);
- res = new_res;
- new_res = NULL;
- }
- devres_free(new_res);
- return res;
- }
- void *devres_remove(struct udevice *dev, dr_release_t release,
- dr_match_t match, void *match_data)
- {
- void *res;
- res = devres_find(dev, release, match, match_data);
- if (res) {
- struct devres *dr = container_of(res, struct devres, data);
- list_del_init(&dr->entry);
- devres_log(dev, dr, "REM");
- }
- return res;
- }
- int devres_destroy(struct udevice *dev, dr_release_t release,
- dr_match_t match, void *match_data)
- {
- void *res;
- res = devres_remove(dev, release, match, match_data);
- if (unlikely(!res))
- return -ENOENT;
- devres_free(res);
- return 0;
- }
- int devres_release(struct udevice *dev, dr_release_t release,
- dr_match_t match, void *match_data)
- {
- void *res;
- res = devres_remove(dev, release, match, match_data);
- if (unlikely(!res))
- return -ENOENT;
- (*release)(dev, res);
- devres_free(res);
- return 0;
- }
- static void release_nodes(struct udevice *dev, struct list_head *head,
- bool probe_only)
- {
- struct devres *dr, *tmp;
- list_for_each_entry_safe_reverse(dr, tmp, head, entry) {
- if (probe_only && !dr->probe)
- break;
- devres_log(dev, dr, "REL");
- dr->release(dev, dr->data);
- list_del(&dr->entry);
- kfree(dr);
- }
- }
- void devres_release_probe(struct udevice *dev)
- {
- release_nodes(dev, &dev->devres_head, true);
- }
- void devres_release_all(struct udevice *dev)
- {
- release_nodes(dev, &dev->devres_head, false);
- }
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