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/*
* Device manager
*
* Copyright (c) 2014 Google, Inc
*
* (C) Copyright 2012
* Pavel Herrmann <morpheus.ibis@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <errno.h>
#include <malloc.h>
#include <dm/device.h>
#include <dm/device-internal.h>
#include <dm/uclass.h>
#include <dm/uclass-internal.h>
#include <dm/util.h>
/**
* device_chld_unbind() - Unbind all device's children from the device
*
* On error, the function continues to unbind all children, and reports the
* first error.
*
* @dev: The device that is to be stripped of its children
* @return 0 on success, -ve on error
*/
static int device_chld_unbind(struct udevice *dev)
{
struct udevice *pos, *n;
int ret, saved_ret = 0;
assert(dev);
list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
ret = device_unbind(pos);
if (ret && !saved_ret)
saved_ret = ret;
}
return saved_ret;
}
/**
* device_chld_remove() - Stop all device's children
* @dev: The device whose children are to be removed
* @pre_os_remove: Flag, if this functions is called in the pre-OS stage
* @return 0 on success, -ve on error
*/
static int device_chld_remove(struct udevice *dev, uint flags)
{
struct udevice *pos, *n;
int ret;
assert(dev);
list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
ret = device_remove(pos, flags);
if (ret)
return ret;
}
return 0;
}
int device_unbind(struct udevice *dev)
{
const struct driver *drv;
int ret;
if (!dev)
return -EINVAL;
if (dev->flags & DM_FLAG_ACTIVATED)
return -EINVAL;
if (!(dev->flags & DM_FLAG_BOUND))
return -EINVAL;
drv = dev->driver;
assert(drv);
if (drv->unbind) {
ret = drv->unbind(dev);
if (ret)
return ret;
}
ret = device_chld_unbind(dev);
if (ret)
return ret;
if (dev->flags & DM_FLAG_ALLOC_PDATA) {
free(dev->platdata);
dev->platdata = NULL;
}
if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
free(dev->uclass_platdata);
dev->uclass_platdata = NULL;
}
if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
free(dev->parent_platdata);
dev->parent_platdata = NULL;
}
ret = uclass_unbind_device(dev);
if (ret)
return ret;
if (dev->parent)
list_del(&dev->sibling_node);
devres_release_all(dev);
if (dev->flags & DM_FLAG_NAME_ALLOCED)
free((char *)dev->name);
free(dev);
return 0;
}
/**
* device_free() - Free memory buffers allocated by a device
* @dev: Device that is to be started
*/
void device_free(struct udevice *dev)
{
int size;
if (dev->driver->priv_auto_alloc_size) {
free(dev->priv);
dev->priv = NULL;
}
size = dev->uclass->uc_drv->per_device_auto_alloc_size;
if (size) {
free(dev->uclass_priv);
dev->uclass_priv = NULL;
}
if (dev->parent) {
size = dev->parent->driver->per_child_auto_alloc_size;
if (!size) {
size = dev->parent->uclass->uc_drv->
per_child_auto_alloc_size;
}
if (size) {
free(dev->parent_priv);
dev->parent_priv = NULL;
}
}
devres_release_probe(dev);
}
static bool flags_remove(uint flags, uint drv_flags)
{
if ((flags & DM_REMOVE_NORMAL) ||
(flags & (drv_flags & (DM_FLAG_ACTIVE_DMA | DM_FLAG_OS_PREPARE))))
return true;
return false;
}
int device_remove(struct udevice *dev, uint flags)
{
const struct driver *drv;
int ret;
if (!dev)
return -EINVAL;
if (!(dev->flags & DM_FLAG_ACTIVATED))
return 0;
drv = dev->driver;
assert(drv);
ret = uclass_pre_remove_device(dev);
if (ret)
return ret;
ret = device_chld_remove(dev, flags);
if (ret)
goto err;
/*
* Remove the device if called with the "normal" remove flag set,
* or if the remove flag matches any of the drivers remove flags
*/
if (drv->remove && flags_remove(flags, drv->flags)) {
ret = drv->remove(dev);
if (ret)
goto err_remove;
}
if (dev->parent && dev->parent->driver->child_post_remove) {
ret = dev->parent->driver->child_post_remove(dev);
if (ret) {
dm_warn("%s: Device '%s' failed child_post_remove()",
__func__, dev->name);
}
}
if (flags_remove(flags, drv->flags)) {
device_free(dev);
dev->seq = -1;
dev->flags &= ~DM_FLAG_ACTIVATED;
}
return ret;
err_remove:
/* We can't put the children back */
dm_warn("%s: Device '%s' failed to remove, but children are gone\n",
__func__, dev->name);
err:
ret = uclass_post_probe_device(dev);
if (ret) {
dm_warn("%s: Device '%s' failed to post_probe on error path\n",
__func__, dev->name);
}
return ret;
}
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