drivers/core/device.c - github/trini/u-boot - Gitiles

 /*
  * 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_child(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;
 	}

 	if (drv->probe) {
 		ret = drv->probe(dev);
 		if (ret)
 			goto fail;
 	}

 	dev->flags |= DM_FLAG_ACTIVATED;

 	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_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;
 }
	/*
	* 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_child(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;
	}

	if (drv->probe) {
	ret = drv->probe(dev);
	if (ret)
	goto fail;
	}

	dev->flags \|= DM_FLAG_ACTIVATED;

	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_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;
	}