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u-boot/drivers/core/uclass.c
Michal Suchanek f21954750a dm: core: Do not stop uclass iteration on error 
When probing a device fails NULL pointer is returned, and following
devices in uclass list cannot be iterated. Skip to next device on error
instead.

With that the only condition under which these simple iteration
functions return error is when the dm is not initialized at uclass_get
time. This is not all that interesting, change return type to void.

Fixes: 6494d708bf ("dm: Add base driver model support")
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
2022-10-29 07:36:33 -06:00

838 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2013 Google, Inc
*
* (C) Copyright 2012
* Pavel Herrmann <morpheus.ibis@gmail.com>
*/
#define LOG_CATEGORY LOGC_DM
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <log.h>
#include <malloc.h>
#include <asm/global_data.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) {
void *ptr;
ptr = calloc(1, uc_drv->priv_auto);
if (!ptr) {
ret = -ENOMEM;
goto fail_mem;
}
uclass_set_priv(uc, ptr);
}
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) {
free(uclass_get_priv(uc));
uclass_set_priv(uc, 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, DM_REMOVE_NORMAL | DM_REMOVE_NO_PD);
if (ret)
return log_msg_ret("remove", ret);
ret = device_unbind(dev);
if (ret)
return log_msg_ret("unbind", ret);
}
uc_drv = uc->uc_drv;
if (uc_drv->destroy)
uc_drv->destroy(uc);
list_del(&uc->sibling_node);
if (uc_drv->priv_auto)
free(uclass_get_priv(uc));
free(uc);
return 0;
}
int uclass_get(enum uclass_id id, struct uclass **ucp)
{
struct uclass *uc;
/* Immediately fail if driver model is not set up */
if (!gd->uclass_root)
return -EDEADLK;
*ucp = NULL;
uc = uclass_find(id);
if (!uc) {
if (CONFIG_IS_ENABLED(OF_PLATDATA_INST))
return -ENOENT;
return uclass_add(id, ucp);
}
*ucp = uc;
return 0;
}
const char *uclass_get_name(enum uclass_id id)
{
struct uclass *uc;
if (uclass_get(id, &uc))
return NULL;
return uc->uc_drv->name;
}
void *uclass_get_priv(const struct uclass *uc)
{
return uc->priv_;
}
void uclass_set_priv(struct uclass *uc, void *priv)
{
uc->priv_ = priv;
}
enum uclass_id uclass_get_by_namelen(const char *name, int len)
{
int i;
for (i = 0; i < UCLASS_COUNT; i++) {
struct uclass_driver *uc_drv = lists_uclass_lookup(i);
if (uc_drv && !strncmp(uc_drv->name, name, len) &&
strlen(uc_drv->name) == len)
return i;
}
return UCLASS_INVALID;
}
enum uclass_id uclass_get_by_name(const char *name)
{
return uclass_get_by_namelen(name, strlen(name));
}
int dev_get_uclass_index(struct udevice *dev, struct uclass **ucp)
{
struct udevice *iter;
struct uclass *uc = dev->uclass;
int i = 0;
if (list_empty(&uc->dev_head))
return -ENODEV;
uclass_foreach_dev(iter, uc) {
if (iter == dev) {
if (ucp)
*ucp = uc;
return i;
}
i++;
}
return -ENODEV;
}
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;
uclass_foreach_dev(dev, uc) {
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_namelen(enum uclass_id id, const char *name, int len,
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;
uclass_foreach_dev(dev, uc) {
if (!strncmp(dev->name, name, len) &&
strlen(dev->name) == len) {
*devp = dev;
return 0;
}
}
return -ENODEV;
}
int uclass_find_device_by_name(enum uclass_id id, const char *name,
struct udevice **devp)
{
return uclass_find_device_by_namelen(id, name, strlen(name), devp);
}
int uclass_find_next_free_seq(struct uclass *uc)
{
struct udevice *dev;
int max = -1;
/* If using aliases, start with the highest alias value */
if (CONFIG_IS_ENABLED(DM_SEQ_ALIAS) &&
(uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS))
max = dev_read_alias_highest_id(uc->uc_drv->name);
/* Avoid conflict with existing devices */
list_for_each_entry(dev, &uc->dev_head, uclass_node) {
if (dev->seq_ > max)
max = dev->seq_;
}
/*
* At this point, max will be -1 if there are no existing aliases or
* devices
*/
return max + 1;
}
int uclass_find_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
{
struct uclass *uc;
struct udevice *dev;
int ret;
*devp = NULL;
log_debug("%d\n", seq);
if (seq == -1)
return -ENODEV;
ret = uclass_get(id, &uc);
if (ret)
return ret;
uclass_foreach_dev(dev, uc) {
log_debug(" - %d '%s'\n", dev->seq_, dev->name);
if (dev->seq_ == seq) {
*devp = dev;
log_debug(" - found\n");
return 0;
}
}
log_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;
uclass_foreach_dev(dev, uc) {
if (dev_of_offset(dev) == node) {
*devp = dev;
return 0;
}
}
return -ENODEV;
}
int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node,
struct udevice **devp)
{
struct uclass *uc;
struct udevice *dev;
int ret;
log(LOGC_DM, LOGL_DEBUG, "Looking for %s\n", ofnode_get_name(node));
*devp = NULL;
if (!ofnode_valid(node))
return -ENODEV;
ret = uclass_get(id, &uc);
if (ret)
return ret;
uclass_foreach_dev(dev, uc) {
log(LOGC_DM, LOGL_DEBUG_CONTENT, " - checking %s\n",
dev->name);
if (ofnode_equal(dev_ofnode(dev), node)) {
*devp = dev;
goto done;
}
}
ret = -ENODEV;
done:
log(LOGC_DM, LOGL_DEBUG, " - result for %s: %s (ret=%d)\n",
ofnode_get_name(node), *devp ? (*devp)->name : "(none)", ret);
return ret;
}
#if CONFIG_IS_ENABLED(OF_REAL)
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 = dev_read_u32_default(parent, name, -1);
if (find_phandle <= 0)
return -ENOENT;
ret = uclass_get(id, &uc);
if (ret)
return ret;
uclass_foreach_dev(dev, uc) {
uint phandle;
phandle = dev_read_phandle(dev);
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;
uclass_foreach_dev(dev, uc) {
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, &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);
}
int uclass_get_device_by_ofnode(enum uclass_id id, ofnode node,
struct udevice **devp)
{
struct udevice *dev;
int ret;
log(LOGC_DM, LOGL_DEBUG, "Looking for %s\n", ofnode_get_name(node));
*devp = NULL;
ret = uclass_find_device_by_ofnode(id, node, &dev);
log(LOGC_DM, LOGL_DEBUG, " - result for %s: %s (ret=%d)\n",
ofnode_get_name(node), dev ? dev->name : "(none)", ret);
return uclass_get_device_tail(dev, ret, devp);
}
#if CONFIG_IS_ENABLED(OF_CONTROL)
int uclass_get_device_by_phandle_id(enum uclass_id id, uint phandle_id,
struct udevice **devp)
{
struct udevice *dev;
struct uclass *uc;
int ret;
*devp = NULL;
ret = uclass_get(id, &uc);
if (ret)
return ret;
uclass_foreach_dev(dev, uc) {
uint phandle;
phandle = dev_read_phandle(dev);
if (phandle == phandle_id) {
*devp = dev;
return uclass_get_device_tail(dev, ret, devp);
}
}
return -ENODEV;
}
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
/*
* Starting from the given device @dev, return pointer to the first device in
* the uclass that probes successfully in @devp.
*/
static void _uclass_next_device(struct udevice *dev, struct udevice **devp)
{
for (; dev; uclass_find_next_device(&dev)) {
if (!device_probe(dev))
break;
}
*devp = dev;
}
void uclass_first_device(enum uclass_id id, struct udevice **devp)
{
struct udevice *dev;
int ret;
ret = uclass_find_first_device(id, &dev);
_uclass_next_device(dev, devp);
}
void uclass_next_device(struct udevice **devp)
{
struct udevice *dev = *devp;
uclass_find_next_device(&dev);
_uclass_next_device(dev, devp);
}
int uclass_first_device_err(enum uclass_id id, struct udevice **devp)
{
int ret;
ret = uclass_first_device_check(id, devp);
if (ret)
return ret;
else if (!*devp)
return -ENODEV;
return 0;
}
int uclass_next_device_err(struct udevice **devp)
{
int ret;
ret = uclass_next_device_check(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_get_count(void)
{
const struct uclass *uc;
int count = 0;
if (gd->dm_root) {
list_for_each_entry(uc, gd->uclass_root, sibling_node)
count++;
}
return count;
}
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_pre_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;
}
return 0;
}
int uclass_unbind_device(struct udevice *dev)
{
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, err;
err = uclass_first_device_check(id, &dev);
/* Scanning uclass to probe all devices */
while (dev) {
ret = uclass_next_device_check(&dev);
if (ret)
err = ret;
}
return err;
}
int uclass_id_count(enum uclass_id id)
{
struct udevice *dev;
struct uclass *uc;
int count = 0;
uclass_id_foreach_dev(id, dev, uc)
count++;
return count;
}
UCLASS_DRIVER(nop) = {
.id = UCLASS_NOP,
.name = "nop",
};
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