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https://github.com/brain-hackers/u-boot-brain
synced 2024-08-28 21:09:00 +09:00
![Heiko Schocher](/assets/img/avatar_default.png)
using UBI and DM together leads in compiler error, as both define a "struct device", so rename "struct device" in include/dm/device.h to "struct udevice", as we use linux code (MTD/UBI/UBIFS some USB code,...) and cannot change the linux "struct device" Signed-off-by: Heiko Schocher <hs@denx.de> Cc: Simon Glass <sjg@chromium.org> Cc: Marek Vasut <marex@denx.de>
349 lines
6.3 KiB
C
349 lines
6.3 KiB
C
/*
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* Device manager
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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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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <malloc.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/platdata.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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#include <linux/err.h>
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#include <linux/list.h>
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/**
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* device_chld_unbind() - Unbind all device's children from the device
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*
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* On error, the function continues to unbind all children, and reports the
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* first error.
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*
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* @dev: The device that is to be stripped of its children
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* @return 0 on success, -ve on error
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*/
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static int device_chld_unbind(struct udevice *dev)
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{
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struct udevice *pos, *n;
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int ret, saved_ret = 0;
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assert(dev);
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list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
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ret = device_unbind(pos);
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if (ret && !saved_ret)
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saved_ret = ret;
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}
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return saved_ret;
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}
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/**
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* device_chld_remove() - Stop all device's children
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* @dev: The device whose children are to be removed
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* @return 0 on success, -ve on error
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*/
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static int device_chld_remove(struct udevice *dev)
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{
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struct udevice *pos, *n;
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int ret;
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assert(dev);
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list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) {
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ret = device_remove(pos);
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if (ret)
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return ret;
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}
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return 0;
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}
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int device_bind(struct udevice *parent, struct driver *drv, const char *name,
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void *platdata, int of_offset, 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 = 0;
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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(drv->id, &uc);
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if (ret)
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return ret;
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dev = calloc(1, sizeof(struct udevice));
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if (!dev)
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return -ENOMEM;
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INIT_LIST_HEAD(&dev->sibling_node);
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INIT_LIST_HEAD(&dev->child_head);
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INIT_LIST_HEAD(&dev->uclass_node);
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dev->platdata = platdata;
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dev->name = name;
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dev->of_offset = of_offset;
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dev->parent = parent;
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dev->driver = drv;
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dev->uclass = uc;
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if (!dev->platdata && drv->platdata_auto_alloc_size)
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dev->flags |= DM_FLAG_ALLOC_PDATA;
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/* put dev into parent's successor list */
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if (parent)
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list_add_tail(&dev->sibling_node, &parent->child_head);
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ret = uclass_bind_device(dev);
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if (ret)
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goto fail_bind;
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/* if we fail to bind we remove device from successors and free it */
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if (drv->bind) {
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ret = drv->bind(dev);
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if (ret) {
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if (uclass_unbind_device(dev)) {
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dm_warn("Failed to unbind dev '%s' on error path\n",
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dev->name);
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}
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goto fail_bind;
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}
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}
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if (parent)
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dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
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*devp = dev;
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return 0;
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fail_bind:
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list_del(&dev->sibling_node);
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free(dev);
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return ret;
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}
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int device_bind_by_name(struct udevice *parent, const struct driver_info *info,
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struct udevice **devp)
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{
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struct driver *drv;
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drv = lists_driver_lookup_name(info->name);
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if (!drv)
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return -ENOENT;
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return device_bind(parent, drv, info->name, (void *)info->platdata,
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-1, devp);
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}
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int device_unbind(struct udevice *dev)
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{
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struct driver *drv;
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int ret;
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if (!dev)
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return -EINVAL;
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if (dev->flags & DM_FLAG_ACTIVATED)
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return -EINVAL;
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drv = dev->driver;
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assert(drv);
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if (drv->unbind) {
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ret = drv->unbind(dev);
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if (ret)
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return ret;
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}
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ret = device_chld_unbind(dev);
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if (ret)
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return ret;
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ret = uclass_unbind_device(dev);
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if (ret)
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return ret;
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if (dev->parent)
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list_del(&dev->sibling_node);
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free(dev);
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return 0;
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}
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/**
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* device_free() - Free memory buffers allocated by a device
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* @dev: Device that is to be started
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*/
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static void device_free(struct udevice *dev)
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{
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int size;
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if (dev->driver->priv_auto_alloc_size) {
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free(dev->priv);
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dev->priv = NULL;
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}
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if (dev->flags & DM_FLAG_ALLOC_PDATA) {
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free(dev->platdata);
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dev->platdata = NULL;
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}
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size = dev->uclass->uc_drv->per_device_auto_alloc_size;
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if (size) {
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free(dev->uclass_priv);
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dev->uclass_priv = NULL;
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}
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}
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int device_probe(struct udevice *dev)
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{
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struct driver *drv;
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int size = 0;
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int ret;
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if (!dev)
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return -EINVAL;
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if (dev->flags & DM_FLAG_ACTIVATED)
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return 0;
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drv = dev->driver;
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assert(drv);
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/* Allocate private data and platdata if requested */
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if (drv->priv_auto_alloc_size) {
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dev->priv = calloc(1, drv->priv_auto_alloc_size);
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if (!dev->priv) {
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ret = -ENOMEM;
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goto fail;
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}
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}
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/* Allocate private data if requested */
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if (dev->flags & DM_FLAG_ALLOC_PDATA) {
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dev->platdata = calloc(1, drv->platdata_auto_alloc_size);
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if (!dev->platdata) {
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ret = -ENOMEM;
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goto fail;
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}
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}
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size = dev->uclass->uc_drv->per_device_auto_alloc_size;
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if (size) {
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dev->uclass_priv = calloc(1, size);
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if (!dev->uclass_priv) {
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ret = -ENOMEM;
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goto fail;
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}
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}
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/* Ensure all parents are probed */
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if (dev->parent) {
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ret = device_probe(dev->parent);
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if (ret)
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goto fail;
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}
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if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
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ret = drv->ofdata_to_platdata(dev);
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if (ret)
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goto fail;
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}
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if (drv->probe) {
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ret = drv->probe(dev);
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if (ret)
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goto fail;
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}
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dev->flags |= DM_FLAG_ACTIVATED;
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ret = uclass_post_probe_device(dev);
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if (ret) {
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dev->flags &= ~DM_FLAG_ACTIVATED;
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goto fail_uclass;
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}
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return 0;
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fail_uclass:
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if (device_remove(dev)) {
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dm_warn("%s: Device '%s' failed to remove on error path\n",
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__func__, dev->name);
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}
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fail:
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device_free(dev);
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return ret;
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}
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int device_remove(struct udevice *dev)
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{
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struct driver *drv;
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int ret;
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if (!dev)
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return -EINVAL;
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if (!(dev->flags & DM_FLAG_ACTIVATED))
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return 0;
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drv = dev->driver;
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assert(drv);
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ret = uclass_pre_remove_device(dev);
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if (ret)
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return ret;
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ret = device_chld_remove(dev);
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if (ret)
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goto err;
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if (drv->remove) {
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ret = drv->remove(dev);
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if (ret)
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goto err_remove;
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}
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device_free(dev);
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dev->flags &= ~DM_FLAG_ACTIVATED;
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return 0;
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err_remove:
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/* We can't put the children back */
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dm_warn("%s: Device '%s' failed to remove, but children are gone\n",
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__func__, dev->name);
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err:
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ret = uclass_post_probe_device(dev);
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if (ret) {
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dm_warn("%s: Device '%s' failed to post_probe on error path\n",
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__func__, dev->name);
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}
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return ret;
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}
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void *dev_get_platdata(struct udevice *dev)
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{
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if (!dev) {
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dm_warn("%s: null device", __func__);
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return NULL;
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}
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return dev->platdata;
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}
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void *dev_get_priv(struct udevice *dev)
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{
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if (!dev) {
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dm_warn("%s: null device", __func__);
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return NULL;
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}
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return dev->priv;
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}
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