u-boot/drivers/core/uclass.c
Simon Glass c57f806bf2 dm: core: Add a way to find a device by its driver
Some SoCs have a single clock device. Provide a way to find it given its
driver name. This is handled by the linker so will fail if the name is not
found, avoiding strange errors when names change and do not match. It is
also faster than a string comparison.

Signed-off-by: Simon Glass <sjg@chromium.org>
2016-07-25 20:46:43 -06:00

570 lines
11 KiB
C

/*
* Copyright (c) 2013 Google, Inc
*
* (C) Copyright 2012
* Pavel Herrmann <morpheus.ibis@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <errno.h>
#include <malloc.h>
#include <dm/device.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/uclass.h>
#include <dm/uclass-internal.h>
#include <dm/util.h>
DECLARE_GLOBAL_DATA_PTR;
struct uclass *uclass_find(enum uclass_id key)
{
struct uclass *uc;
if (!gd->dm_root)
return NULL;
/*
* TODO(sjg@chromium.org): Optimise this, perhaps moving the found
* node to the start of the list, or creating a linear array mapping
* id to node.
*/
list_for_each_entry(uc, &gd->uclass_root, sibling_node) {
if (uc->uc_drv->id == key)
return uc;
}
return NULL;
}
/**
* uclass_add() - Create new uclass in list
* @id: Id number to create
* @ucp: Returns pointer to uclass, or NULL on error
* @return 0 on success, -ve on error
*
* The new uclass is added to the list. There must be only one uclass for
* each id.
*/
static int uclass_add(enum uclass_id id, struct uclass **ucp)
{
struct uclass_driver *uc_drv;
struct uclass *uc;
int ret;
*ucp = NULL;
uc_drv = lists_uclass_lookup(id);
if (!uc_drv) {
debug("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n",
id);
/*
* Use a strange error to make this case easier to find. When
* a uclass is not available it can prevent driver model from
* starting up and this failure is otherwise hard to debug.
*/
return -EPFNOSUPPORT;
}
uc = calloc(1, sizeof(*uc));
if (!uc)
return -ENOMEM;
if (uc_drv->priv_auto_alloc_size) {
uc->priv = calloc(1, uc_drv->priv_auto_alloc_size);
if (!uc->priv) {
ret = -ENOMEM;
goto fail_mem;
}
}
uc->uc_drv = uc_drv;
INIT_LIST_HEAD(&uc->sibling_node);
INIT_LIST_HEAD(&uc->dev_head);
list_add(&uc->sibling_node, &DM_UCLASS_ROOT_NON_CONST);
if (uc_drv->init) {
ret = uc_drv->init(uc);
if (ret)
goto fail;
}
*ucp = uc;
return 0;
fail:
if (uc_drv->priv_auto_alloc_size) {
free(uc->priv);
uc->priv = NULL;
}
list_del(&uc->sibling_node);
fail_mem:
free(uc);
return ret;
}
int uclass_destroy(struct uclass *uc)
{
struct uclass_driver *uc_drv;
struct udevice *dev;
int ret;
/*
* We cannot use list_for_each_entry_safe() here. If a device in this
* uclass has a child device also in this uclass, it will be also be
* unbound (by the recursion in the call to device_unbind() below).
* We can loop until the list is empty.
*/
while (!list_empty(&uc->dev_head)) {
dev = list_first_entry(&uc->dev_head, struct udevice,
uclass_node);
ret = device_remove(dev);
if (ret)
return ret;
ret = device_unbind(dev);
if (ret)
return ret;
}
uc_drv = uc->uc_drv;
if (uc_drv->destroy)
uc_drv->destroy(uc);
list_del(&uc->sibling_node);
if (uc_drv->priv_auto_alloc_size)
free(uc->priv);
free(uc);
return 0;
}
int uclass_get(enum uclass_id id, struct uclass **ucp)
{
struct uclass *uc;
*ucp = NULL;
uc = uclass_find(id);
if (!uc)
return uclass_add(id, ucp);
*ucp = uc;
return 0;
}
int uclass_find_device(enum uclass_id id, int index, struct udevice **devp)
{
struct uclass *uc;
struct udevice *dev;
int ret;
*devp = NULL;
ret = uclass_get(id, &uc);
if (ret)
return ret;
if (list_empty(&uc->dev_head))
return -ENODEV;
list_for_each_entry(dev, &uc->dev_head, uclass_node) {
if (!index--) {
*devp = dev;
return 0;
}
}
return -ENODEV;
}
int uclass_find_first_device(enum uclass_id id, struct udevice **devp)
{
struct uclass *uc;
int ret;
*devp = NULL;
ret = uclass_get(id, &uc);
if (ret)
return ret;
if (list_empty(&uc->dev_head))
return 0;
*devp = list_first_entry(&uc->dev_head, struct udevice, uclass_node);
return 0;
}
int uclass_find_next_device(struct udevice **devp)
{
struct udevice *dev = *devp;
*devp = NULL;
if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head))
return 0;
*devp = list_entry(dev->uclass_node.next, struct udevice, uclass_node);
return 0;
}
int uclass_find_device_by_name(enum uclass_id id, const char *name,
struct udevice **devp)
{
struct uclass *uc;
struct udevice *dev;
int ret;
*devp = NULL;
if (!name)
return -EINVAL;
ret = uclass_get(id, &uc);
if (ret)
return ret;
list_for_each_entry(dev, &uc->dev_head, uclass_node) {
if (!strncmp(dev->name, name, strlen(name))) {
*devp = dev;
return 0;
}
}
return -ENODEV;
}
int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
bool find_req_seq, struct udevice **devp)
{
struct uclass *uc;
struct udevice *dev;
int ret;
*devp = NULL;
debug("%s: %d %d\n", __func__, find_req_seq, seq_or_req_seq);
if (seq_or_req_seq == -1)
return -ENODEV;
ret = uclass_get(id, &uc);
if (ret)
return ret;
list_for_each_entry(dev, &uc->dev_head, uclass_node) {
debug(" - %d %d\n", dev->req_seq, dev->seq);
if ((find_req_seq ? dev->req_seq : dev->seq) ==
seq_or_req_seq) {
*devp = dev;
debug(" - found\n");
return 0;
}
}
debug(" - not found\n");
return -ENODEV;
}
int uclass_find_device_by_of_offset(enum uclass_id id, int node,
struct udevice **devp)
{
struct uclass *uc;
struct udevice *dev;
int ret;
*devp = NULL;
if (node < 0)
return -ENODEV;
ret = uclass_get(id, &uc);
if (ret)
return ret;
list_for_each_entry(dev, &uc->dev_head, uclass_node) {
if (dev->of_offset == node) {
*devp = dev;
return 0;
}
}
return -ENODEV;
}
#if CONFIG_IS_ENABLED(OF_CONTROL)
static int uclass_find_device_by_phandle(enum uclass_id id,
struct udevice *parent,
const char *name,
struct udevice **devp)
{
struct udevice *dev;
struct uclass *uc;
int find_phandle;
int ret;
*devp = NULL;
find_phandle = fdtdec_get_int(gd->fdt_blob, parent->of_offset, name,
-1);
if (find_phandle <= 0)
return -ENOENT;
ret = uclass_get(id, &uc);
if (ret)
return ret;
list_for_each_entry(dev, &uc->dev_head, uclass_node) {
uint phandle = fdt_get_phandle(gd->fdt_blob, dev->of_offset);
if (phandle == find_phandle) {
*devp = dev;
return 0;
}
}
return -ENODEV;
}
#endif
int uclass_get_device_by_driver(enum uclass_id id,
const struct driver *find_drv,
struct udevice **devp)
{
struct udevice *dev;
struct uclass *uc;
int ret;
ret = uclass_get(id, &uc);
if (ret)
return ret;
list_for_each_entry(dev, &uc->dev_head, uclass_node) {
if (dev->driver == find_drv)
return uclass_get_device_tail(dev, 0, devp);
}
return -ENODEV;
}
int uclass_get_device_tail(struct udevice *dev, int ret,
struct udevice **devp)
{
if (ret)
return ret;
assert(dev);
ret = device_probe(dev);
if (ret)
return ret;
*devp = dev;
return 0;
}
int uclass_get_device(enum uclass_id id, int index, struct udevice **devp)
{
struct udevice *dev;
int ret;
*devp = NULL;
ret = uclass_find_device(id, index, &dev);
return uclass_get_device_tail(dev, ret, devp);
}
int uclass_get_device_by_name(enum uclass_id id, const char *name,
struct udevice **devp)
{
struct udevice *dev;
int ret;
*devp = NULL;
ret = uclass_find_device_by_name(id, name, &dev);
return uclass_get_device_tail(dev, ret, devp);
}
int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
{
struct udevice *dev;
int ret;
*devp = NULL;
ret = uclass_find_device_by_seq(id, 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 = uclass_find_device_by_seq(id, seq, true, &dev);
}
return uclass_get_device_tail(dev, ret, devp);
}
int uclass_get_device_by_of_offset(enum uclass_id id, int node,
struct udevice **devp)
{
struct udevice *dev;
int ret;
*devp = NULL;
ret = uclass_find_device_by_of_offset(id, node, &dev);
return uclass_get_device_tail(dev, ret, devp);
}
#if CONFIG_IS_ENABLED(OF_CONTROL)
int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
const char *name, struct udevice **devp)
{
struct udevice *dev;
int ret;
*devp = NULL;
ret = uclass_find_device_by_phandle(id, parent, name, &dev);
return uclass_get_device_tail(dev, ret, devp);
}
#endif
int uclass_first_device(enum uclass_id id, struct udevice **devp)
{
struct udevice *dev;
int ret;
*devp = NULL;
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_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_resolve_seq(struct udevice *dev)
{
struct udevice *dup;
int seq;
int ret;
assert(dev->seq == -1);
ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, dev->req_seq,
false, &dup);
if (!ret) {
dm_warn("Device '%s': seq %d is in use by '%s'\n",
dev->name, dev->req_seq, dup->name);
} else if (ret == -ENODEV) {
/* Our requested sequence number is available */
if (dev->req_seq != -1)
return dev->req_seq;
} else {
return ret;
}
for (seq = 0; seq < DM_MAX_SEQ; seq++) {
ret = uclass_find_device_by_seq(dev->uclass->uc_drv->id, seq,
false, &dup);
if (ret == -ENODEV)
break;
if (ret)
return ret;
}
return seq;
}
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)
return uc_drv->child_pre_probe(dev);
return 0;
}
int uclass_post_probe_device(struct udevice *dev)
{
struct uclass_driver *uc_drv = dev->uclass->uc_drv;
if (uc_drv->post_probe)
return uc_drv->post_probe(dev);
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