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- /*
- * Device manager
- *
- * Copyright (c) 2013 Google, Inc
- *
- * (C) Copyright 2012
- * Pavel Herrmann <morpheus.ibis@gmail.com>
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
- #include <common.h>
- #include <fdtdec.h>
- #include <malloc.h>
- #include <dm/device.h>
- #include <dm/device-internal.h>
- #include <dm/lists.h>
- #include <dm/platdata.h>
- #include <dm/uclass.h>
- #include <dm/uclass-internal.h>
- #include <dm/util.h>
- #include <linux/err.h>
- #include <linux/list.h>
- DECLARE_GLOBAL_DATA_PTR;
- int device_bind(struct udevice *parent, struct driver *drv, const char *name,
- void *platdata, int of_offset, struct udevice **devp)
- {
- struct udevice *dev;
- struct uclass *uc;
- int ret = 0;
- *devp = NULL;
- if (!name)
- return -EINVAL;
- ret = uclass_get(drv->id, &uc);
- if (ret)
- return ret;
- dev = calloc(1, sizeof(struct udevice));
- if (!dev)
- return -ENOMEM;
- INIT_LIST_HEAD(&dev->sibling_node);
- INIT_LIST_HEAD(&dev->child_head);
- INIT_LIST_HEAD(&dev->uclass_node);
- dev->platdata = platdata;
- dev->name = name;
- dev->of_offset = of_offset;
- dev->parent = parent;
- dev->driver = drv;
- dev->uclass = uc;
- dev->seq = -1;
- dev->req_seq = -1;
- #ifdef CONFIG_OF_CONTROL
- /*
- * Some devices, such as a SPI bus, I2C bus and serial ports are
- * numbered using aliases.
- *
- * This is just a 'requested' sequence, and will be
- * resolved (and ->seq updated) when the device is probed.
- */
- if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
- if (uc->uc_drv->name && of_offset != -1) {
- fdtdec_get_alias_seq(gd->fdt_blob, uc->uc_drv->name,
- of_offset, &dev->req_seq);
- }
- }
- #endif
- if (!dev->platdata && drv->platdata_auto_alloc_size) {
- dev->flags |= DM_FLAG_ALLOC_PDATA;
- dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
- if (!dev->platdata) {
- ret = -ENOMEM;
- goto fail_alloc1;
- }
- }
- if (parent) {
- int size = parent->driver->per_child_platdata_auto_alloc_size;
- if (!size) {
- size = parent->uclass->uc_drv->
- per_child_platdata_auto_alloc_size;
- }
- if (size) {
- dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
- dev->parent_platdata = calloc(1, size);
- if (!dev->parent_platdata) {
- ret = -ENOMEM;
- goto fail_alloc2;
- }
- }
- }
- /* put dev into parent's successor list */
- if (parent)
- list_add_tail(&dev->sibling_node, &parent->child_head);
- ret = uclass_bind_device(dev);
- if (ret)
- goto fail_uclass_bind;
- /* if we fail to bind we remove device from successors and free it */
- if (drv->bind) {
- ret = drv->bind(dev);
- if (ret)
- goto fail_bind;
- }
- if (parent && parent->driver->child_post_bind) {
- ret = parent->driver->child_post_bind(dev);
- if (ret)
- goto fail_child_post_bind;
- }
- if (parent)
- dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
- *devp = dev;
- return 0;
- fail_child_post_bind:
- if (drv->unbind && drv->unbind(dev)) {
- dm_warn("unbind() method failed on dev '%s' on error path\n",
- dev->name);
- }
- fail_bind:
- if (uclass_unbind_device(dev)) {
- dm_warn("Failed to unbind dev '%s' on error path\n",
- dev->name);
- }
- fail_uclass_bind:
- list_del(&dev->sibling_node);
- if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
- free(dev->parent_platdata);
- dev->parent_platdata = NULL;
- }
- fail_alloc2:
- if (dev->flags & DM_FLAG_ALLOC_PDATA) {
- free(dev->platdata);
- dev->platdata = NULL;
- }
- fail_alloc1:
- free(dev);
- return ret;
- }
- int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
- const struct driver_info *info, struct udevice **devp)
- {
- struct driver *drv;
- drv = lists_driver_lookup_name(info->name);
- if (!drv)
- return -ENOENT;
- if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
- return -EPERM;
- return device_bind(parent, drv, info->name, (void *)info->platdata,
- -1, devp);
- }
- int device_probe_child(struct udevice *dev, void *parent_priv)
- {
- struct driver *drv;
- int size = 0;
- int ret;
- int seq;
- if (!dev)
- return -EINVAL;
- if (dev->flags & DM_FLAG_ACTIVATED)
- return 0;
- drv = dev->driver;
- assert(drv);
- /* Allocate private data if requested */
- if (drv->priv_auto_alloc_size) {
- dev->priv = calloc(1, drv->priv_auto_alloc_size);
- if (!dev->priv) {
- ret = -ENOMEM;
- goto fail;
- }
- }
- /* Allocate private data if requested */
- size = dev->uclass->uc_drv->per_device_auto_alloc_size;
- if (size) {
- dev->uclass_priv = calloc(1, size);
- if (!dev->uclass_priv) {
- ret = -ENOMEM;
- goto fail;
- }
- }
- /* Ensure all parents are probed */
- 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) {
- dev->parent_priv = calloc(1, size);
- if (!dev->parent_priv) {
- ret = -ENOMEM;
- goto fail;
- }
- if (parent_priv)
- memcpy(dev->parent_priv, parent_priv, size);
- }
- ret = device_probe(dev->parent);
- if (ret)
- goto fail;
- }
- seq = uclass_resolve_seq(dev);
- if (seq < 0) {
- ret = seq;
- goto fail;
- }
- dev->seq = seq;
- ret = uclass_pre_probe_device(dev);
- if (ret)
- goto fail;
- if (dev->parent && dev->parent->driver->child_pre_probe) {
- ret = dev->parent->driver->child_pre_probe(dev);
- if (ret)
- goto fail;
- }
- if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
- ret = drv->ofdata_to_platdata(dev);
- if (ret)
- goto fail;
- }
- dev->flags |= DM_FLAG_ACTIVATED;
- if (drv->probe) {
- ret = drv->probe(dev);
- if (ret) {
- dev->flags &= ~DM_FLAG_ACTIVATED;
- goto fail;
- }
- }
- ret = uclass_post_probe_device(dev);
- if (ret) {
- dev->flags &= ~DM_FLAG_ACTIVATED;
- goto fail_uclass;
- }
- return 0;
- fail_uclass:
- if (device_remove(dev)) {
- dm_warn("%s: Device '%s' failed to remove on error path\n",
- __func__, dev->name);
- }
- fail:
- dev->seq = -1;
- device_free(dev);
- return ret;
- }
- int device_probe(struct udevice *dev)
- {
- return device_probe_child(dev, NULL);
- }
- void *dev_get_platdata(struct udevice *dev)
- {
- if (!dev) {
- dm_warn("%s: null device\n", __func__);
- return NULL;
- }
- return dev->platdata;
- }
- void *dev_get_parent_platdata(struct udevice *dev)
- {
- if (!dev) {
- dm_warn("%s: null device", __func__);
- return NULL;
- }
- return dev->parent_platdata;
- }
- void *dev_get_priv(struct udevice *dev)
- {
- if (!dev) {
- dm_warn("%s: null device\n", __func__);
- return NULL;
- }
- return dev->priv;
- }
- void *dev_get_uclass_priv(struct udevice *dev)
- {
- if (!dev) {
- dm_warn("%s: null device\n", __func__);
- return NULL;
- }
- return dev->uclass_priv;
- }
- void *dev_get_parentdata(struct udevice *dev)
- {
- if (!dev) {
- dm_warn("%s: null device\n", __func__);
- return NULL;
- }
- return dev->parent_priv;
- }
- static int device_get_device_tail(struct udevice *dev, int ret,
- struct udevice **devp)
- {
- if (ret)
- return ret;
- ret = device_probe(dev);
- if (ret)
- return ret;
- *devp = dev;
- return 0;
- }
- int device_get_child(struct udevice *parent, int index, struct udevice **devp)
- {
- struct udevice *dev;
- list_for_each_entry(dev, &parent->child_head, sibling_node) {
- if (!index--)
- return device_get_device_tail(dev, 0, devp);
- }
- return -ENODEV;
- }
- int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
- bool find_req_seq, struct udevice **devp)
- {
- struct udevice *dev;
- *devp = NULL;
- if (seq_or_req_seq == -1)
- return -ENODEV;
- list_for_each_entry(dev, &parent->child_head, sibling_node) {
- if ((find_req_seq ? dev->req_seq : dev->seq) ==
- seq_or_req_seq) {
- *devp = dev;
- return 0;
- }
- }
- return -ENODEV;
- }
- int device_get_child_by_seq(struct udevice *parent, int seq,
- struct udevice **devp)
- {
- struct udevice *dev;
- int ret;
- *devp = NULL;
- ret = device_find_child_by_seq(parent, seq, false, &dev);
- if (ret == -ENODEV) {
- /*
- * We didn't find it in probed devices. See if there is one
- * that will request this seq if probed.
- */
- ret = device_find_child_by_seq(parent, seq, true, &dev);
- }
- return device_get_device_tail(dev, ret, devp);
- }
- int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
- struct udevice **devp)
- {
- struct udevice *dev;
- *devp = NULL;
- list_for_each_entry(dev, &parent->child_head, sibling_node) {
- if (dev->of_offset == of_offset) {
- *devp = dev;
- return 0;
- }
- }
- return -ENODEV;
- }
- int device_get_child_by_of_offset(struct udevice *parent, int seq,
- struct udevice **devp)
- {
- struct udevice *dev;
- int ret;
- *devp = NULL;
- ret = device_find_child_by_of_offset(parent, seq, &dev);
- return device_get_device_tail(dev, ret, devp);
- }
- int device_find_first_child(struct udevice *parent, struct udevice **devp)
- {
- if (list_empty(&parent->child_head)) {
- *devp = NULL;
- } else {
- *devp = list_first_entry(&parent->child_head, struct udevice,
- sibling_node);
- }
- return 0;
- }
- int device_find_next_child(struct udevice **devp)
- {
- struct udevice *dev = *devp;
- struct udevice *parent = dev->parent;
- if (list_is_last(&dev->sibling_node, &parent->child_head)) {
- *devp = NULL;
- } else {
- *devp = list_entry(dev->sibling_node.next, struct udevice,
- sibling_node);
- }
- return 0;
- }
- struct udevice *dev_get_parent(struct udevice *child)
- {
- return child->parent;
- }
- ulong dev_get_of_data(struct udevice *dev)
- {
- return dev->of_id->data;
- }
- enum uclass_id device_get_uclass_id(struct udevice *dev)
- {
- return dev->uclass->uc_drv->id;
- }
- #ifdef CONFIG_OF_CONTROL
- fdt_addr_t dev_get_addr(struct udevice *dev)
- {
- return fdtdec_get_addr(gd->fdt_blob, dev->of_offset, "reg");
- }
- #else
- fdt_addr_t dev_get_addr(struct udevice *dev)
- {
- return FDT_ADDR_T_NONE;
- }
- #endif
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