787 lines
14 KiB
C
787 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2013 Google, Inc
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*
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* (C) Copyright 2012
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* Pavel Herrmann <morpheus.ibis@gmail.com>
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*/
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#define LOG_CATEGORY LOGC_DM
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <log.h>
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#include <malloc.h>
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#include <asm/global_data.h>
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#include <dm/device.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <dm/uclass.h>
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#include <dm/uclass-internal.h>
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#include <dm/util.h>
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DECLARE_GLOBAL_DATA_PTR;
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struct uclass *uclass_find(enum uclass_id key)
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{
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struct uclass *uc;
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if (!gd->dm_root)
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return NULL;
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/*
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* TODO(sjg@chromium.org): Optimise this, perhaps moving the found
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* node to the start of the list, or creating a linear array mapping
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* id to node.
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*/
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list_for_each_entry(uc, gd->uclass_root, sibling_node) {
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if (uc->uc_drv->id == key)
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return uc;
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}
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return NULL;
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}
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/**
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* uclass_add() - Create new uclass in list
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* @id: Id number to create
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* @ucp: Returns pointer to uclass, or NULL on error
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* @return 0 on success, -ve on error
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*
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* The new uclass is added to the list. There must be only one uclass for
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* each id.
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*/
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static int uclass_add(enum uclass_id id, struct uclass **ucp)
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{
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struct uclass_driver *uc_drv;
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struct uclass *uc;
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int ret;
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*ucp = NULL;
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uc_drv = lists_uclass_lookup(id);
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if (!uc_drv) {
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debug("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n",
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id);
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/*
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* Use a strange error to make this case easier to find. When
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* a uclass is not available it can prevent driver model from
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* starting up and this failure is otherwise hard to debug.
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*/
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return -EPFNOSUPPORT;
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}
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uc = calloc(1, sizeof(*uc));
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if (!uc)
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return -ENOMEM;
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if (uc_drv->priv_auto) {
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void *ptr;
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ptr = calloc(1, uc_drv->priv_auto);
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if (!ptr) {
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ret = -ENOMEM;
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goto fail_mem;
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}
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uclass_set_priv(uc, ptr);
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}
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uc->uc_drv = uc_drv;
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INIT_LIST_HEAD(&uc->sibling_node);
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INIT_LIST_HEAD(&uc->dev_head);
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list_add(&uc->sibling_node, DM_UCLASS_ROOT_NON_CONST);
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if (uc_drv->init) {
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ret = uc_drv->init(uc);
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if (ret)
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goto fail;
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}
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*ucp = uc;
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return 0;
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fail:
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if (uc_drv->priv_auto) {
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free(uclass_get_priv(uc));
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uclass_set_priv(uc, NULL);
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}
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list_del(&uc->sibling_node);
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fail_mem:
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free(uc);
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return ret;
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}
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int uclass_destroy(struct uclass *uc)
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{
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struct uclass_driver *uc_drv;
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struct udevice *dev;
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int ret;
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/*
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* We cannot use list_for_each_entry_safe() here. If a device in this
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* uclass has a child device also in this uclass, it will be also be
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* unbound (by the recursion in the call to device_unbind() below).
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* We can loop until the list is empty.
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*/
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while (!list_empty(&uc->dev_head)) {
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dev = list_first_entry(&uc->dev_head, struct udevice,
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uclass_node);
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ret = device_remove(dev, DM_REMOVE_NORMAL | DM_REMOVE_NO_PD);
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if (ret)
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return log_msg_ret("remove", ret);
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ret = device_unbind(dev);
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if (ret)
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return log_msg_ret("unbind", ret);
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}
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uc_drv = uc->uc_drv;
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if (uc_drv->destroy)
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uc_drv->destroy(uc);
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list_del(&uc->sibling_node);
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if (uc_drv->priv_auto)
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free(uclass_get_priv(uc));
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free(uc);
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return 0;
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}
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int uclass_get(enum uclass_id id, struct uclass **ucp)
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{
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struct uclass *uc;
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*ucp = NULL;
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uc = uclass_find(id);
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if (!uc) {
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if (CONFIG_IS_ENABLED(OF_PLATDATA_INST))
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return -ENOENT;
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return uclass_add(id, ucp);
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}
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*ucp = uc;
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return 0;
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}
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const char *uclass_get_name(enum uclass_id id)
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{
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struct uclass *uc;
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if (uclass_get(id, &uc))
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return NULL;
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return uc->uc_drv->name;
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}
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void *uclass_get_priv(const struct uclass *uc)
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{
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return uc->priv_;
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}
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void uclass_set_priv(struct uclass *uc, void *priv)
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{
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uc->priv_ = priv;
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}
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enum uclass_id uclass_get_by_name(const char *name)
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{
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int i;
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for (i = 0; i < UCLASS_COUNT; i++) {
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struct uclass_driver *uc_drv = lists_uclass_lookup(i);
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if (uc_drv && !strcmp(uc_drv->name, name))
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return i;
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}
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return UCLASS_INVALID;
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}
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int dev_get_uclass_index(struct udevice *dev, struct uclass **ucp)
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{
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struct udevice *iter;
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struct uclass *uc = dev->uclass;
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int i = 0;
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if (list_empty(&uc->dev_head))
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return -ENODEV;
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uclass_foreach_dev(iter, uc) {
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if (iter == dev) {
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if (ucp)
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*ucp = uc;
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return i;
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}
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i++;
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}
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return -ENODEV;
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}
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int uclass_find_device(enum uclass_id id, int index, struct udevice **devp)
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{
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struct uclass *uc;
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struct udevice *dev;
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int ret;
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*devp = NULL;
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ret = uclass_get(id, &uc);
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if (ret)
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return ret;
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if (list_empty(&uc->dev_head))
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return -ENODEV;
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uclass_foreach_dev(dev, uc) {
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if (!index--) {
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*devp = dev;
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return 0;
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}
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}
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return -ENODEV;
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}
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int uclass_find_first_device(enum uclass_id id, struct udevice **devp)
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{
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struct uclass *uc;
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int ret;
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*devp = NULL;
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ret = uclass_get(id, &uc);
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if (ret)
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return ret;
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if (list_empty(&uc->dev_head))
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return 0;
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*devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node);
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return 0;
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}
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int uclass_find_next_device(struct udevice **devp)
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{
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struct udevice *dev = *devp;
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*devp = NULL;
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if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head))
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return 0;
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*devp = list_entry(dev->uclass_node.next, struct udevice, uclass_node);
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return 0;
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}
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int uclass_find_device_by_name(enum uclass_id id, const char *name,
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struct udevice **devp)
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{
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struct uclass *uc;
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struct udevice *dev;
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int ret;
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*devp = NULL;
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if (!name)
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return -EINVAL;
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ret = uclass_get(id, &uc);
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if (ret)
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return ret;
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uclass_foreach_dev(dev, uc) {
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if (!strcmp(dev->name, name)) {
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*devp = dev;
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return 0;
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}
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}
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return -ENODEV;
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}
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int uclass_find_next_free_seq(struct uclass *uc)
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{
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struct udevice *dev;
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int max = -1;
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/* If using aliases, start with the highest alias value */
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if (CONFIG_IS_ENABLED(DM_SEQ_ALIAS) &&
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(uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS))
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max = dev_read_alias_highest_id(uc->uc_drv->name);
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/* Avoid conflict with existing devices */
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list_for_each_entry(dev, &uc->dev_head, uclass_node) {
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if (dev->seq_ > max)
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max = dev->seq_;
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}
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/*
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* At this point, max will be -1 if there are no existing aliases or
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* devices
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*/
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return max + 1;
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}
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int uclass_find_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
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{
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struct uclass *uc;
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struct udevice *dev;
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int ret;
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*devp = NULL;
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log_debug("%d\n", seq);
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if (seq == -1)
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return -ENODEV;
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ret = uclass_get(id, &uc);
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if (ret)
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return ret;
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uclass_foreach_dev(dev, uc) {
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log_debug(" - %d '%s'\n", dev->seq_, dev->name);
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if (dev->seq_ == seq) {
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*devp = dev;
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log_debug(" - found\n");
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return 0;
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}
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}
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log_debug(" - not found\n");
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return -ENODEV;
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}
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int uclass_find_device_by_of_offset(enum uclass_id id, int node,
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struct udevice **devp)
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{
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struct uclass *uc;
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struct udevice *dev;
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int ret;
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*devp = NULL;
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if (node < 0)
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return -ENODEV;
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ret = uclass_get(id, &uc);
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if (ret)
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return ret;
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uclass_foreach_dev(dev, uc) {
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if (dev_of_offset(dev) == node) {
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*devp = dev;
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return 0;
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}
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}
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return -ENODEV;
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}
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int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node,
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struct udevice **devp)
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{
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struct uclass *uc;
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struct udevice *dev;
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int ret;
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log(LOGC_DM, LOGL_DEBUG, "Looking for %s\n", ofnode_get_name(node));
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*devp = NULL;
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if (!ofnode_valid(node))
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return -ENODEV;
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ret = uclass_get(id, &uc);
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if (ret)
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return ret;
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uclass_foreach_dev(dev, uc) {
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log(LOGC_DM, LOGL_DEBUG_CONTENT, " - checking %s\n",
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dev->name);
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if (ofnode_equal(dev_ofnode(dev), node)) {
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*devp = dev;
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goto done;
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}
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}
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ret = -ENODEV;
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done:
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log(LOGC_DM, LOGL_DEBUG, " - result for %s: %s (ret=%d)\n",
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ofnode_get_name(node), *devp ? (*devp)->name : "(none)", ret);
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return ret;
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}
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#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
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int uclass_find_device_by_phandle(enum uclass_id id, struct udevice *parent,
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const char *name, struct udevice **devp)
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{
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struct udevice *dev;
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struct uclass *uc;
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int find_phandle;
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int ret;
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*devp = NULL;
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find_phandle = dev_read_u32_default(parent, name, -1);
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if (find_phandle <= 0)
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return -ENOENT;
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ret = uclass_get(id, &uc);
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if (ret)
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return ret;
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uclass_foreach_dev(dev, uc) {
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uint phandle;
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phandle = dev_read_phandle(dev);
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if (phandle == find_phandle) {
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*devp = dev;
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return 0;
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}
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}
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return -ENODEV;
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}
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#endif
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int uclass_get_device_by_driver(enum uclass_id id,
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const struct driver *find_drv,
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struct udevice **devp)
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{
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struct udevice *dev;
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struct uclass *uc;
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int ret;
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ret = uclass_get(id, &uc);
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if (ret)
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return ret;
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uclass_foreach_dev(dev, uc) {
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if (dev->driver == find_drv)
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return uclass_get_device_tail(dev, 0, devp);
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}
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return -ENODEV;
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}
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int uclass_get_device_tail(struct udevice *dev, int ret, struct udevice **devp)
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{
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if (ret)
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return ret;
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assert(dev);
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ret = device_probe(dev);
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if (ret)
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return ret;
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*devp = dev;
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return 0;
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}
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int uclass_get_device(enum uclass_id id, int index, struct udevice **devp)
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{
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struct udevice *dev;
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int ret;
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*devp = NULL;
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ret = uclass_find_device(id, index, &dev);
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return uclass_get_device_tail(dev, ret, devp);
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}
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int uclass_get_device_by_name(enum uclass_id id, const char *name,
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struct udevice **devp)
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{
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struct udevice *dev;
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int ret;
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*devp = NULL;
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ret = uclass_find_device_by_name(id, name, &dev);
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return uclass_get_device_tail(dev, ret, devp);
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}
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int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
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{
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struct udevice *dev;
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int ret;
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*devp = NULL;
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ret = uclass_find_device_by_seq(id, seq, &dev);
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return uclass_get_device_tail(dev, ret, devp);
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}
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|
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int uclass_get_device_by_of_offset(enum uclass_id id, int node,
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struct udevice **devp)
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{
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struct udevice *dev;
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int ret;
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*devp = NULL;
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ret = uclass_find_device_by_of_offset(id, node, &dev);
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return uclass_get_device_tail(dev, ret, devp);
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}
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|
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int uclass_get_device_by_ofnode(enum uclass_id id, ofnode node,
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struct udevice **devp)
|
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{
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struct udevice *dev;
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int ret;
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log(LOGC_DM, LOGL_DEBUG, "Looking for %s\n", ofnode_get_name(node));
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*devp = NULL;
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ret = uclass_find_device_by_ofnode(id, node, &dev);
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log(LOGC_DM, LOGL_DEBUG, " - result for %s: %s (ret=%d)\n",
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ofnode_get_name(node), dev ? dev->name : "(none)", ret);
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return uclass_get_device_tail(dev, ret, devp);
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}
|
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|
|
#if CONFIG_IS_ENABLED(OF_CONTROL)
|
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int uclass_get_device_by_phandle_id(enum uclass_id id, uint phandle_id,
|
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struct udevice **devp)
|
|
{
|
|
struct udevice *dev;
|
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struct uclass *uc;
|
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int ret;
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*devp = NULL;
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ret = uclass_get(id, &uc);
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if (ret)
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return ret;
|
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|
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uclass_foreach_dev(dev, uc) {
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uint phandle;
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phandle = dev_read_phandle(dev);
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if (phandle == phandle_id) {
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*devp = dev;
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return uclass_get_device_tail(dev, ret, devp);
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}
|
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}
|
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|
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return -ENODEV;
|
|
}
|
|
|
|
int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
|
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const char *name, struct udevice **devp)
|
|
{
|
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struct udevice *dev;
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int ret;
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|
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*devp = NULL;
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ret = uclass_find_device_by_phandle(id, parent, name, &dev);
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return uclass_get_device_tail(dev, ret, devp);
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}
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#endif
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|
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int uclass_first_device(enum uclass_id id, struct udevice **devp)
|
|
{
|
|
struct udevice *dev;
|
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int ret;
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|
|
*devp = NULL;
|
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ret = uclass_find_first_device(id, &dev);
|
|
if (!dev)
|
|
return 0;
|
|
return uclass_get_device_tail(dev, ret, devp);
|
|
}
|
|
|
|
int uclass_first_device_err(enum uclass_id id, struct udevice **devp)
|
|
{
|
|
int ret;
|
|
|
|
ret = uclass_first_device(id, devp);
|
|
if (ret)
|
|
return ret;
|
|
else if (!*devp)
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int uclass_next_device(struct udevice **devp)
|
|
{
|
|
struct udevice *dev = *devp;
|
|
int ret;
|
|
|
|
*devp = NULL;
|
|
ret = uclass_find_next_device(&dev);
|
|
if (!dev)
|
|
return 0;
|
|
return uclass_get_device_tail(dev, ret, devp);
|
|
}
|
|
|
|
int uclass_next_device_err(struct udevice **devp)
|
|
{
|
|
int ret;
|
|
|
|
ret = uclass_next_device(devp);
|
|
if (ret)
|
|
return ret;
|
|
else if (!*devp)
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int uclass_first_device_check(enum uclass_id id, struct udevice **devp)
|
|
{
|
|
int ret;
|
|
|
|
*devp = NULL;
|
|
ret = uclass_find_first_device(id, devp);
|
|
if (ret)
|
|
return ret;
|
|
if (!*devp)
|
|
return 0;
|
|
|
|
return device_probe(*devp);
|
|
}
|
|
|
|
int uclass_next_device_check(struct udevice **devp)
|
|
{
|
|
int ret;
|
|
|
|
ret = uclass_find_next_device(devp);
|
|
if (ret)
|
|
return ret;
|
|
if (!*devp)
|
|
return 0;
|
|
|
|
return device_probe(*devp);
|
|
}
|
|
|
|
int uclass_first_device_drvdata(enum uclass_id id, ulong driver_data,
|
|
struct udevice **devp)
|
|
{
|
|
struct udevice *dev;
|
|
struct uclass *uc;
|
|
|
|
uclass_id_foreach_dev(id, dev, uc) {
|
|
if (dev_get_driver_data(dev) == driver_data) {
|
|
*devp = dev;
|
|
|
|
return device_probe(dev);
|
|
}
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
int uclass_bind_device(struct udevice *dev)
|
|
{
|
|
struct uclass *uc;
|
|
int ret;
|
|
|
|
uc = dev->uclass;
|
|
list_add_tail(&dev->uclass_node, &uc->dev_head);
|
|
|
|
if (dev->parent) {
|
|
struct uclass_driver *uc_drv = dev->parent->uclass->uc_drv;
|
|
|
|
if (uc_drv->child_post_bind) {
|
|
ret = uc_drv->child_post_bind(dev);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
err:
|
|
/* There is no need to undo the parent's post_bind call */
|
|
list_del(&dev->uclass_node);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
|
|
int uclass_unbind_device(struct udevice *dev)
|
|
{
|
|
struct uclass *uc;
|
|
int ret;
|
|
|
|
uc = dev->uclass;
|
|
if (uc->uc_drv->pre_unbind) {
|
|
ret = uc->uc_drv->pre_unbind(dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
list_del(&dev->uclass_node);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int uclass_pre_probe_device(struct udevice *dev)
|
|
{
|
|
struct uclass_driver *uc_drv;
|
|
int ret;
|
|
|
|
uc_drv = dev->uclass->uc_drv;
|
|
if (uc_drv->pre_probe) {
|
|
ret = uc_drv->pre_probe(dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (!dev->parent)
|
|
return 0;
|
|
uc_drv = dev->parent->uclass->uc_drv;
|
|
if (uc_drv->child_pre_probe) {
|
|
ret = uc_drv->child_pre_probe(dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int uclass_post_probe_device(struct udevice *dev)
|
|
{
|
|
struct uclass_driver *uc_drv;
|
|
int ret;
|
|
|
|
if (dev->parent) {
|
|
uc_drv = dev->parent->uclass->uc_drv;
|
|
if (uc_drv->child_post_probe) {
|
|
ret = uc_drv->child_post_probe(dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
uc_drv = dev->uclass->uc_drv;
|
|
if (uc_drv->post_probe) {
|
|
ret = uc_drv->post_probe(dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
|
|
int uclass_pre_remove_device(struct udevice *dev)
|
|
{
|
|
struct uclass *uc;
|
|
int ret;
|
|
|
|
uc = dev->uclass;
|
|
if (uc->uc_drv->pre_remove) {
|
|
ret = uc->uc_drv->pre_remove(dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int uclass_probe_all(enum uclass_id id)
|
|
{
|
|
struct udevice *dev;
|
|
int ret;
|
|
|
|
ret = uclass_first_device(id, &dev);
|
|
if (ret || !dev)
|
|
return ret;
|
|
|
|
/* Scanning uclass to probe all devices */
|
|
while (dev) {
|
|
ret = uclass_next_device(&dev);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
UCLASS_DRIVER(nop) = {
|
|
.id = UCLASS_NOP,
|
|
.name = "nop",
|
|
};
|