u-boot/drivers/core/device.c
Simon Glass 0379597e55 dm: core: Don't set pinctrl for pinctrl devices
There is sort-of race condition when a pinctrl device is probed. The pinctrl
function is called which may end up using the same device as is being
probed. This results in operations being used before the device is actually
probed.

For now, disallow pinctrl operations on pinctrl devices while probing. An
alternative solution would be to move the operation to later in the
device_probe() function (for pinctrl devices only) but this needs more
thought.

Signed-off-by: Simon Glass <sjg@chromium.org>
2016-01-21 20:42:34 -07:00

700 lines
14 KiB
C

/*
* 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 <fdt_support.h>
#include <malloc.h>
#include <dm/device.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/pinctrl.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, const struct driver *drv,
const char *name, void *platdata, int of_offset,
struct udevice **devp)
{
struct udevice *dev;
struct uclass *uc;
int size, ret = 0;
if (devp)
*devp = NULL;
if (!name)
return -EINVAL;
ret = uclass_get(drv->id, &uc);
if (ret) {
debug("Missing uclass for driver %s\n", drv->name);
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);
#ifdef CONFIG_DEVRES
INIT_LIST_HEAD(&dev->devres_head);
#endif
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;
if (CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_SEQ_ALIAS)) {
/*
* 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);
}
}
}
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;
}
}
size = uc->uc_drv->per_device_platdata_auto_alloc_size;
if (size) {
dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA;
dev->uclass_platdata = calloc(1, size);
if (!dev->uclass_platdata) {
ret = -ENOMEM;
goto fail_alloc2;
}
}
if (parent) {
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_alloc3;
}
}
}
/* 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 (uc->uc_drv->post_bind) {
ret = uc->uc_drv->post_bind(dev);
if (ret)
goto fail_uclass_post_bind;
}
if (parent)
dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
if (devp)
*devp = dev;
dev->flags |= DM_FLAG_BOUND;
return 0;
fail_uclass_post_bind:
/* There is no child unbind() method, so no clean-up required */
fail_child_post_bind:
if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
if (drv->unbind && drv->unbind(dev)) {
dm_warn("unbind() method failed on dev '%s' on error path\n",
dev->name);
}
}
fail_bind:
if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
if (uclass_unbind_device(dev)) {
dm_warn("Failed to unbind dev '%s' on error path\n",
dev->name);
}
}
fail_uclass_bind:
if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
list_del(&dev->sibling_node);
if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
free(dev->parent_platdata);
dev->parent_platdata = NULL;
}
}
fail_alloc3:
if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
free(dev->uclass_platdata);
dev->uclass_platdata = NULL;
}
fail_alloc2:
if (dev->flags & DM_FLAG_ALLOC_PDATA) {
free(dev->platdata);
dev->platdata = NULL;
}
fail_alloc1:
devres_release_all(dev);
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);
}
static void *alloc_priv(int size, uint flags)
{
void *priv;
if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
priv = memalign(ARCH_DMA_MINALIGN, size);
if (priv)
memset(priv, '\0', size);
} else {
priv = calloc(1, size);
}
return priv;
}
int device_probe_child(struct udevice *dev, void *parent_priv)
{
const 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 and not reentered */
if (drv->priv_auto_alloc_size && !dev->priv) {
dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
if (!dev->priv) {
ret = -ENOMEM;
goto fail;
}
}
/* Allocate private data if requested and not reentered */
size = dev->uclass->uc_drv->per_device_auto_alloc_size;
if (size && !dev->uclass_priv) {
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) {
dev->parent_priv = alloc_priv(size, drv->flags);
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;
/*
* The device might have already been probed during
* the call to device_probe() on its parent device
* (e.g. PCI bridge devices). Test the flags again
* so that we don't mess up the device.
*/
if (dev->flags & DM_FLAG_ACTIVATED)
return 0;
}
seq = uclass_resolve_seq(dev);
if (seq < 0) {
ret = seq;
goto fail;
}
dev->seq = seq;
dev->flags |= DM_FLAG_ACTIVATED;
/*
* Process pinctrl for everything except the root device, and
* continue regardless of the result of pinctrl. Don't process pinctrl
* settings for pinctrl devices since the device may not yet be
* probed.
*/
if (dev->parent && device_get_uclass_id(dev) != UCLASS_PINCTRL)
pinctrl_select_state(dev, "default");
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;
}
if (drv->probe) {
ret = drv->probe(dev);
if (ret) {
dev->flags &= ~DM_FLAG_ACTIVATED;
goto fail;
}
}
ret = uclass_post_probe_device(dev);
if (ret)
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->flags &= ~DM_FLAG_ACTIVATED;
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\n", __func__);
return NULL;
}
return dev->parent_platdata;
}
void *dev_get_uclass_platdata(struct udevice *dev)
{
if (!dev) {
dm_warn("%s: null device\n", __func__);
return NULL;
}
return dev->uclass_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_parent_priv(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 node,
struct udevice **devp)
{
struct udevice *dev;
int ret;
*devp = NULL;
ret = device_find_child_by_of_offset(parent, node, &dev);
return device_get_device_tail(dev, ret, devp);
}
static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
int of_offset)
{
struct udevice *dev, *found;
if (parent->of_offset == of_offset)
return parent;
list_for_each_entry(dev, &parent->child_head, sibling_node) {
found = _device_find_global_by_of_offset(dev, of_offset);
if (found)
return found;
}
return NULL;
}
int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
{
struct udevice *dev;
dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
return device_get_device_tail(dev, dev ? 0 : -ENOENT, 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_driver_data(struct udevice *dev)
{
return dev->driver_data;
}
const void *dev_get_driver_ops(struct udevice *dev)
{
if (!dev || !dev->driver->ops)
return NULL;
return dev->driver->ops;
}
enum uclass_id device_get_uclass_id(struct udevice *dev)
{
return dev->uclass->uc_drv->id;
}
const char *dev_get_uclass_name(struct udevice *dev)
{
if (!dev)
return NULL;
return dev->uclass->uc_drv->name;
}
fdt_addr_t dev_get_addr_index(struct udevice *dev, int index)
{
#if CONFIG_IS_ENABLED(OF_CONTROL)
fdt_addr_t addr;
if (CONFIG_IS_ENABLED(OF_TRANSLATE)) {
const fdt32_t *reg;
int len = 0;
int na, ns;
na = fdt_address_cells(gd->fdt_blob, dev->parent->of_offset);
if (na < 1) {
debug("bad #address-cells\n");
return FDT_ADDR_T_NONE;
}
ns = fdt_size_cells(gd->fdt_blob, dev->parent->of_offset);
if (ns < 0) {
debug("bad #size-cells\n");
return FDT_ADDR_T_NONE;
}
reg = fdt_getprop(gd->fdt_blob, dev->of_offset, "reg", &len);
if (!reg || (len <= (index * sizeof(fdt32_t) * (na + ns)))) {
debug("Req index out of range\n");
return FDT_ADDR_T_NONE;
}
reg += index * (na + ns);
/*
* Use the full-fledged translate function for complex
* bus setups.
*/
addr = fdt_translate_address((void *)gd->fdt_blob,
dev->of_offset, reg);
} else {
/*
* Use the "simple" translate function for less complex
* bus setups.
*/
addr = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
dev->parent->of_offset,
dev->of_offset, "reg",
index, NULL);
if (CONFIG_IS_ENABLED(SIMPLE_BUS) && addr != FDT_ADDR_T_NONE) {
if (device_get_uclass_id(dev->parent) ==
UCLASS_SIMPLE_BUS)
addr = simple_bus_translate(dev->parent, addr);
}
}
/*
* Some platforms need a special address translation. Those
* platforms (e.g. mvebu in SPL) can configure a translation
* offset in the DM by calling dm_set_translation_offset() that
* will get added to all addresses returned by dev_get_addr().
*/
addr += dm_get_translation_offset();
return addr;
#else
return FDT_ADDR_T_NONE;
#endif
}
fdt_addr_t dev_get_addr(struct udevice *dev)
{
return dev_get_addr_index(dev, 0);
}
bool device_has_children(struct udevice *dev)
{
return !list_empty(&dev->child_head);
}
bool device_has_active_children(struct udevice *dev)
{
struct udevice *child;
for (device_find_first_child(dev, &child);
child;
device_find_next_child(&child)) {
if (device_active(child))
return true;
}
return false;
}
bool device_is_last_sibling(struct udevice *dev)
{
struct udevice *parent = dev->parent;
if (!parent)
return false;
return list_is_last(&dev->sibling_node, &parent->child_head);
}
int device_set_name(struct udevice *dev, const char *name)
{
name = strdup(name);
if (!name)
return -ENOMEM;
dev->name = name;
return 0;
}