123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266 |
- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Device manager
- *
- * Copyright (c) 2014 Google, Inc
- *
- * (C) Copyright 2012
- * Pavel Herrmann <morpheus.ibis@gmail.com>
- */
- #define LOG_CATEGORY LOGC_DM
- #include <common.h>
- #include <errno.h>
- #include <log.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>
- #include <power-domain.h>
- #include <asm/global_data.h>
- int device_chld_unbind(struct udevice *dev, struct driver *drv)
- {
- struct udevice *pos, *n;
- int ret, saved_ret = 0;
- assert(dev);
- list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
- if (drv && (pos->driver != drv))
- continue;
- ret = device_unbind(pos);
- if (ret && !saved_ret) {
- log_warning("device '%s' failed to unbind\n",
- pos->name);
- saved_ret = ret;
- }
- }
- return log_ret(saved_ret);
- }
- int device_chld_remove(struct udevice *dev, struct driver *drv,
- uint flags)
- {
- struct udevice *pos, *n;
- int result = 0;
- assert(dev);
- list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
- int ret;
- if (drv && (pos->driver != drv))
- continue;
- ret = device_remove(pos, flags);
- if (ret == -EPROBE_DEFER)
- result = ret;
- else if (ret && ret != -EKEYREJECTED)
- return ret;
- }
- return result;
- }
- int device_unbind(struct udevice *dev)
- {
- const struct driver *drv;
- int ret;
- if (!dev)
- return log_msg_ret("dev", -EINVAL);
- if (dev_get_flags(dev) & DM_FLAG_ACTIVATED)
- return log_msg_ret("active", -EINVAL);
- if (!(dev_get_flags(dev) & DM_FLAG_BOUND))
- return log_msg_ret("not-bound", -EINVAL);
- drv = dev->driver;
- assert(drv);
- if (drv->unbind) {
- ret = drv->unbind(dev);
- if (ret)
- return log_msg_ret("unbind", ret);
- }
- ret = device_chld_unbind(dev, NULL);
- if (ret)
- return log_msg_ret("child unbind", ret);
- if (dev_get_flags(dev) & DM_FLAG_ALLOC_PDATA) {
- free(dev_get_plat(dev));
- dev_set_plat(dev, NULL);
- }
- if (dev_get_flags(dev) & DM_FLAG_ALLOC_UCLASS_PDATA) {
- free(dev_get_uclass_plat(dev));
- dev_set_uclass_plat(dev, NULL);
- }
- if (dev_get_flags(dev) & DM_FLAG_ALLOC_PARENT_PDATA) {
- free(dev_get_parent_plat(dev));
- dev_set_parent_plat(dev, NULL);
- }
- ret = uclass_unbind_device(dev);
- if (ret)
- return log_msg_ret("uc", ret);
- if (dev->parent)
- list_del(&dev->sibling_node);
- devres_release_all(dev);
- if (dev_get_flags(dev) & 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) {
- free(dev_get_priv(dev));
- dev_set_priv(dev, NULL);
- }
- size = dev->uclass->uc_drv->per_device_auto;
- if (size) {
- free(dev_get_uclass_priv(dev));
- dev_set_uclass_priv(dev, NULL);
- }
- if (dev->parent) {
- size = dev->parent->driver->per_child_auto;
- if (!size) {
- size = dev->parent->uclass->uc_drv->
- per_child_auto;
- }
- if (size) {
- free(dev_get_parent_priv(dev));
- dev_set_parent_priv(dev, NULL);
- }
- }
- dev_bic_flags(dev, DM_FLAG_PLATDATA_VALID);
- devres_release_probe(dev);
- }
- /**
- * flags_remove() - Figure out whether to remove a device
- *
- * If this is called with @flags == DM_REMOVE_NON_VITAL | DM_REMOVE_ACTIVE_DMA,
- * then it returns 0 (=go head and remove) if the device is not matked vital
- * but is marked DM_REMOVE_ACTIVE_DMA.
- *
- * If this is called with @flags == DM_REMOVE_ACTIVE_DMA,
- * then it returns 0 (=go head and remove) if the device is marked
- * DM_REMOVE_ACTIVE_DMA, regardless of whether it is marked vital.
- *
- * @flags: Flags passed to device_remove()
- * @drv_flags: Driver flags
- * @return 0 if the device should be removed,
- * -EKEYREJECTED if @flags includes a flag in DM_REMOVE_ACTIVE_ALL but
- * @drv_flags does not (indicates that this device has nothing to do for
- * DMA shutdown or OS prepare)
- * -EPROBE_DEFER if @flags is DM_REMOVE_NON_VITAL but @drv_flags contains
- * DM_FLAG_VITAL (indicates the device is vital and should not be removed)
- */
- static int flags_remove(uint flags, uint drv_flags)
- {
- if (!(flags & DM_REMOVE_NORMAL)) {
- bool vital_match;
- bool active_match;
- active_match = !(flags & DM_REMOVE_ACTIVE_ALL) ||
- (drv_flags & flags);
- vital_match = !(flags & DM_REMOVE_NON_VITAL) ||
- !(drv_flags & DM_FLAG_VITAL);
- if (!vital_match)
- return -EPROBE_DEFER;
- if (!active_match)
- return -EKEYREJECTED;
- }
- return 0;
- }
- int device_remove(struct udevice *dev, uint flags)
- {
- const struct driver *drv;
- int ret;
- if (!dev)
- return -EINVAL;
- if (!(dev_get_flags(dev) & DM_FLAG_ACTIVATED))
- return 0;
- /*
- * If the child returns EKEYREJECTED, continue. It just means that it
- * didn't match the flags.
- */
- ret = device_chld_remove(dev, NULL, flags);
- if (ret && ret != -EKEYREJECTED)
- return ret;
- /*
- * Remove the device if called with the "normal" remove flag set,
- * or if the remove flag matches any of the drivers remove flags
- */
- drv = dev->driver;
- assert(drv);
- ret = flags_remove(flags, drv->flags);
- if (ret) {
- log_debug("%s: When removing: flags=%x, drv->flags=%x, err=%d\n",
- dev->name, flags, drv->flags, ret);
- return ret;
- }
- ret = uclass_pre_remove_device(dev);
- if (ret)
- return ret;
- if (drv->remove) {
- 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 & DM_REMOVE_NO_PD) &&
- !(drv->flags &
- (DM_FLAG_DEFAULT_PD_CTRL_OFF | DM_FLAG_LEAVE_PD_ON)) &&
- dev != gd->cur_serial_dev)
- dev_power_domain_off(dev);
- device_free(dev);
- dev_bic_flags(dev, DM_FLAG_ACTIVATED);
- return 0;
- 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);
- return ret;
- }
|