u-boot/drivers/core/root.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2013 Google, Inc
*
* (C) Copyright 2012
* Pavel Herrmann <morpheus.ibis@gmail.com>
*/
#include <common.h>
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
#include <linux/libfdt.h>
#include <dm/device.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/of.h>
#include <dm/of_access.h>
#include <dm/platdata.h>
#include <dm/read.h>
#include <dm/root.h>
#include <dm/uclass.h>
#include <dm/util.h>
#include <linux/list.h>
DECLARE_GLOBAL_DATA_PTR;
struct root_priv {
fdt_addr_t translation_offset; /* optional translation offset */
};
static const struct driver_info root_info = {
.name = "root_driver",
};
struct udevice *dm_root(void)
{
if (!gd->dm_root) {
dm_warn("Virtual root driver does not exist!\n");
return NULL;
}
return gd->dm_root;
}
void dm_fixup_for_gd_move(struct global_data *new_gd)
{
/* The sentinel node has moved, so update things that point to it */
if (gd->dm_root) {
new_gd->uclass_root.next->prev = &new_gd->uclass_root;
new_gd->uclass_root.prev->next = &new_gd->uclass_root;
}
}
fdt_addr_t dm_get_translation_offset(void)
{
struct udevice *root = dm_root();
struct root_priv *priv = dev_get_priv(root);
return priv->translation_offset;
}
void dm_set_translation_offset(fdt_addr_t offs)
{
struct udevice *root = dm_root();
struct root_priv *priv = dev_get_priv(root);
priv->translation_offset = offs;
}
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
void fix_drivers(void)
{
struct driver *drv =
ll_entry_start(struct driver, driver);
const int n_ents = ll_entry_count(struct driver, driver);
struct driver *entry;
for (entry = drv; entry != drv + n_ents; entry++) {
if (entry->of_match)
entry->of_match = (const struct udevice_id *)
((u32)entry->of_match + gd->reloc_off);
if (entry->bind)
entry->bind += gd->reloc_off;
if (entry->probe)
entry->probe += gd->reloc_off;
if (entry->remove)
entry->remove += gd->reloc_off;
if (entry->unbind)
entry->unbind += gd->reloc_off;
if (entry->ofdata_to_platdata)
entry->ofdata_to_platdata += gd->reloc_off;
if (entry->child_post_bind)
entry->child_post_bind += gd->reloc_off;
if (entry->child_pre_probe)
entry->child_pre_probe += gd->reloc_off;
if (entry->child_post_remove)
entry->child_post_remove += gd->reloc_off;
/* OPS are fixed in every uclass post_probe function */
if (entry->ops)
entry->ops += gd->reloc_off;
}
}
void fix_uclass(void)
{
struct uclass_driver *uclass =
ll_entry_start(struct uclass_driver, uclass);
const int n_ents = ll_entry_count(struct uclass_driver, uclass);
struct uclass_driver *entry;
for (entry = uclass; entry != uclass + n_ents; entry++) {
if (entry->post_bind)
entry->post_bind += gd->reloc_off;
if (entry->pre_unbind)
entry->pre_unbind += gd->reloc_off;
if (entry->pre_probe)
entry->pre_probe += gd->reloc_off;
if (entry->post_probe)
entry->post_probe += gd->reloc_off;
if (entry->pre_remove)
entry->pre_remove += gd->reloc_off;
if (entry->child_post_bind)
entry->child_post_bind += gd->reloc_off;
if (entry->child_pre_probe)
entry->child_pre_probe += gd->reloc_off;
if (entry->init)
entry->init += gd->reloc_off;
if (entry->destroy)
entry->destroy += gd->reloc_off;
/* FIXME maybe also need to fix these ops */
if (entry->ops)
entry->ops += gd->reloc_off;
}
}
void fix_devices(void)
{
struct driver_info *dev =
ll_entry_start(struct driver_info, driver_info);
const int n_ents = ll_entry_count(struct driver_info, driver_info);
struct driver_info *entry;
for (entry = dev; entry != dev + n_ents; entry++) {
if (entry->platdata)
entry->platdata += gd->reloc_off;
}
}
#endif
int dm_init(bool of_live)
{
int ret;
if (gd->dm_root) {
dm_warn("Virtual root driver already exists!\n");
return -EINVAL;
}
INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST);
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
fix_drivers();
fix_uclass();
fix_devices();
#endif
ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
if (ret)
return ret;
#if CONFIG_IS_ENABLED(OF_CONTROL)
# if CONFIG_IS_ENABLED(OF_LIVE)
if (of_live)
DM_ROOT_NON_CONST->node = np_to_ofnode(gd->of_root);
else
#endif
DM_ROOT_NON_CONST->node = offset_to_ofnode(0);
#endif
ret = device_probe(DM_ROOT_NON_CONST);
if (ret)
return ret;
return 0;
}
int dm_uninit(void)
{
device_remove(dm_root(), DM_REMOVE_NORMAL);
device_unbind(dm_root());
return 0;
}
#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
int dm_remove_devices_flags(uint flags)
{
device_remove(dm_root(), flags);
return 0;
}
#endif
int dm_scan_platdata(bool pre_reloc_only)
{
int ret;
ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
if (ret == -ENOENT) {
dm_warn("Some drivers were not found\n");
ret = 0;
}
return ret;
}
#if CONFIG_IS_ENABLED(OF_LIVE)
static int dm_scan_fdt_live(struct udevice *parent,
const struct device_node *node_parent,
bool pre_reloc_only)
{
struct device_node *np;
int ret = 0, err;
for (np = node_parent->child; np; np = np->sibling) {
if (pre_reloc_only &&
!of_find_property(np, "u-boot,dm-pre-reloc", NULL))
continue;
if (!of_device_is_available(np)) {
pr_debug(" - ignoring disabled device\n");
continue;
}
err = lists_bind_fdt(parent, np_to_ofnode(np), NULL);
if (err && !ret) {
ret = err;
debug("%s: ret=%d\n", np->name, ret);
}
}
if (ret)
dm_warn("Some drivers failed to bind\n");
return ret;
}
#endif /* CONFIG_IS_ENABLED(OF_LIVE) */
#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
/**
* dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
*
* This scans the subnodes of a device tree node and and creates a driver
* for each one.
*
* @parent: Parent device for the devices that will be created
* @blob: Pointer to device tree blob
* @offset: Offset of node to scan
* @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
* flag. If false bind all drivers.
* @return 0 if OK, -ve on error
*/
static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
int offset, bool pre_reloc_only)
{
int ret = 0, err;
for (offset = fdt_first_subnode(blob, offset);
offset > 0;
offset = fdt_next_subnode(blob, offset)) {
/* "chosen" node isn't a device itself but may contain some: */
if (!strcmp(fdt_get_name(blob, offset, NULL), "chosen")) {
pr_debug("parsing subnodes of \"chosen\"\n");
err = dm_scan_fdt_node(parent, blob, offset,
pre_reloc_only);
if (err && !ret)
ret = err;
continue;
}
if (pre_reloc_only &&
!dm_fdt_pre_reloc(blob, offset))
continue;
if (!fdtdec_get_is_enabled(blob, offset)) {
pr_debug(" - ignoring disabled device\n");
continue;
}
err = lists_bind_fdt(parent, offset_to_ofnode(offset), NULL);
if (err && !ret) {
ret = err;
debug("%s: ret=%d\n", fdt_get_name(blob, offset, NULL),
ret);
}
}
if (ret)
dm_warn("Some drivers failed to bind\n");
return ret;
}
int dm_scan_fdt_dev(struct udevice *dev)
{
if (!dev_of_valid(dev))
return 0;
#if CONFIG_IS_ENABLED(OF_LIVE)
if (of_live_active())
return dm_scan_fdt_live(dev, dev_np(dev),
gd->flags & GD_FLG_RELOC ? false : true);
else
#endif
return dm_scan_fdt_node(dev, gd->fdt_blob, dev_of_offset(dev),
gd->flags & GD_FLG_RELOC ? false : true);
}
int dm_scan_fdt(const void *blob, bool pre_reloc_only)
{
#if CONFIG_IS_ENABLED(OF_LIVE)
if (of_live_active())
return dm_scan_fdt_live(gd->dm_root, gd->of_root,
pre_reloc_only);
else
#endif
return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
}
#else
static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
int offset, bool pre_reloc_only)
{
return 0;
}
#endif
int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only)
{
int ret;
ofnode node;
ret = dm_scan_fdt(gd->fdt_blob, pre_reloc_only);
if (ret) {
debug("dm_scan_fdt() failed: %d\n", ret);
return ret;
}
/* bind fixed-clock */
node = ofnode_path("/clocks");
/* if no DT "clocks" node, no need to go further */
if (!ofnode_valid(node))
return ret;
#if CONFIG_IS_ENABLED(OF_LIVE)
if (of_live_active())
ret = dm_scan_fdt_live(gd->dm_root, node.np, pre_reloc_only);
else
#endif
ret = dm_scan_fdt_node(gd->dm_root, gd->fdt_blob, node.of_offset,
pre_reloc_only);
if (ret)
debug("dm_scan_fdt_node() failed: %d\n", ret);
return ret;
}
__weak int dm_scan_other(bool pre_reloc_only)
{
return 0;
}
int dm_init_and_scan(bool pre_reloc_only)
{
int ret;
ret = dm_init(IS_ENABLED(CONFIG_OF_LIVE));
if (ret) {
debug("dm_init() failed: %d\n", ret);
return ret;
}
ret = dm_scan_platdata(pre_reloc_only);
if (ret) {
debug("dm_scan_platdata() failed: %d\n", ret);
return ret;
}
if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
ret = dm_extended_scan_fdt(gd->fdt_blob, pre_reloc_only);
if (ret) {
debug("dm_extended_scan_dt() failed: %d\n", ret);
return ret;
}
}
ret = dm_scan_other(pre_reloc_only);
if (ret)
return ret;
return 0;
}
/* This is the root driver - all drivers are children of this */
U_BOOT_DRIVER(root_driver) = {
.name = "root_driver",
.id = UCLASS_ROOT,
.priv_auto_alloc_size = sizeof(struct root_priv),
};
/* This is the root uclass */
UCLASS_DRIVER(root) = {
.name = "root",
.id = UCLASS_ROOT,
};