u-boot/drivers/core/root.c
Simon Glass cfb9c9b77c dm: core: Use separate priv/plat data region
Make use of the new priv/plat data region if enabled. This is implemented
as a simple offset from the position set up by dtoc to the new position.

So long as all access goes through dm_priv_to_rw() this is safe.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
2021-03-26 17:03:09 +13:00

436 lines
9.6 KiB
C

// 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 <log.h>
#include <malloc.h>
#include <asm-generic/sections.h>
#include <asm/global_data.h>
#include <linux/libfdt.h>
#include <dm/acpi.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;
static 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;
}
}
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 *)
((ulong)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->of_to_plat)
entry->of_to_plat += 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_driver);
const int n_ents = ll_entry_count(struct uclass_driver, uclass_driver);
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->plat)
entry->plat += gd->reloc_off;
}
}
static int dm_setup_inst(void)
{
DM_ROOT_NON_CONST = DM_DEVICE_GET(root);
if (CONFIG_IS_ENABLED(OF_PLATDATA_RT)) {
struct udevice_rt *urt;
void *base;
int n_ents;
uint size;
/* Allocate the udevice_rt table */
n_ents = ll_entry_count(struct udevice, udevice);
urt = calloc(n_ents, sizeof(struct udevice_rt));
if (!urt)
return log_msg_ret("urt", -ENOMEM);
gd_set_dm_udevice_rt(urt);
/* Now allocate space for the priv/plat data, and copy it in */
size = __priv_data_end - __priv_data_start;
base = calloc(1, size);
if (!base)
return log_msg_ret("priv", -ENOMEM);
memcpy(base, __priv_data_start, size);
gd_set_dm_priv_base(base);
}
return 0;
}
int dm_init(bool of_live)
{
int ret;
if (IS_ENABLED(CONFIG_OF_TRANSLATE_ZERO_SIZE_CELLS))
gd->dm_flags |= GD_DM_FLG_SIZE_CELLS_0;
if (gd->dm_root) {
dm_warn("Virtual root driver already exists!\n");
return -EINVAL;
}
if (CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
gd->uclass_root = &uclass_head;
} else {
gd->uclass_root = &DM_UCLASS_ROOT_S_NON_CONST;
INIT_LIST_HEAD(DM_UCLASS_ROOT_NON_CONST);
}
if (IS_ENABLED(CONFIG_NEEDS_MANUAL_RELOC)) {
fix_drivers();
fix_uclass();
fix_devices();
}
if (CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
ret = dm_setup_inst();
if (ret) {
log_debug("dm_setup_inst() failed: %d\n", ret);
return ret;
}
} else {
ret = device_bind_by_name(NULL, false, &root_info,
&DM_ROOT_NON_CONST);
if (ret)
return ret;
if (CONFIG_IS_ENABLED(OF_CONTROL))
dev_set_ofnode(DM_ROOT_NON_CONST, ofnode_root());
ret = device_probe(DM_ROOT_NON_CONST);
if (ret)
return ret;
}
return 0;
}
int dm_uninit(void)
{
/* Remove non-vital devices first */
device_remove(dm_root(), DM_REMOVE_NON_VITAL);
device_remove(dm_root(), DM_REMOVE_NORMAL);
device_unbind(dm_root());
gd->dm_root = NULL;
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_plat(bool pre_reloc_only)
{
int ret;
if (CONFIG_IS_ENABLED(OF_PLATDATA_DRIVER_RT)) {
struct driver_rt *dyn;
int n_ents;
n_ents = ll_entry_count(struct driver_info, driver_info);
dyn = calloc(n_ents, sizeof(struct driver_rt));
if (!dyn)
return -ENOMEM;
gd_set_dm_driver_rt(dyn);
}
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_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
* @node: 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, ofnode parent_node,
bool pre_reloc_only)
{
int ret = 0, err;
ofnode node;
if (!ofnode_valid(parent_node))
return 0;
for (node = ofnode_first_subnode(parent_node);
ofnode_valid(node);
node = ofnode_next_subnode(node)) {
const char *node_name = ofnode_get_name(node);
if (!ofnode_is_enabled(node)) {
pr_debug(" - ignoring disabled device\n");
continue;
}
err = lists_bind_fdt(parent, node, NULL, pre_reloc_only);
if (err && !ret) {
ret = err;
debug("%s: ret=%d\n", node_name, ret);
}
}
if (ret)
dm_warn("Some drivers failed to bind\n");
return ret;
}
int dm_scan_fdt_dev(struct udevice *dev)
{
return dm_scan_fdt_node(dev, dev_ofnode(dev),
gd->flags & GD_FLG_RELOC ? false : true);
}
int dm_scan_fdt(bool pre_reloc_only)
{
return dm_scan_fdt_node(gd->dm_root, ofnode_root(), pre_reloc_only);
}
static int dm_scan_fdt_ofnode_path(const char *path, bool pre_reloc_only)
{
ofnode node;
node = ofnode_path(path);
return dm_scan_fdt_node(gd->dm_root, node, pre_reloc_only);
}
int dm_extended_scan(bool pre_reloc_only)
{
int ret, i;
const char * const nodes[] = {
"/chosen",
"/clocks",
"/firmware"
};
ret = dm_scan_fdt(pre_reloc_only);
if (ret) {
debug("dm_scan_fdt() failed: %d\n", ret);
return ret;
}
/* Some nodes aren't devices themselves but may contain some */
for (i = 0; i < ARRAY_SIZE(nodes); i++) {
ret = dm_scan_fdt_ofnode_path(nodes[i], pre_reloc_only);
if (ret) {
debug("dm_scan_fdt() scan for %s failed: %d\n",
nodes[i], ret);
return ret;
}
}
return ret;
}
#endif
__weak int dm_scan_other(bool pre_reloc_only)
{
return 0;
}
#if CONFIG_IS_ENABLED(OF_PLATDATA_INST) && CONFIG_IS_ENABLED(READ_ONLY)
void *dm_priv_to_rw(void *priv)
{
long offset = priv - (void *)__priv_data_start;
return gd_dm_priv_base() + offset;
}
#endif
/**
* dm_scan() - Scan tables to bind devices
*
* Runs through the driver_info tables and binds the devices it finds. Then runs
* through the devicetree nodes. Finally calls dm_scan_other() to add any
* special devices
*
* @pre_reloc_only: If true, bind only nodes with special devicetree properties,
* or drivers with the DM_FLAG_PRE_RELOC flag. If false bind all drivers.
*/
static int dm_scan(bool pre_reloc_only)
{
int ret;
ret = dm_scan_plat(pre_reloc_only);
if (ret) {
debug("dm_scan_plat() failed: %d\n", ret);
return ret;
}
if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
ret = dm_extended_scan(pre_reloc_only);
if (ret) {
debug("dm_extended_scan() failed: %d\n", ret);
return ret;
}
}
ret = dm_scan_other(pre_reloc_only);
if (ret)
return ret;
return 0;
}
int dm_init_and_scan(bool pre_reloc_only)
{
int ret;
ret = dm_init(CONFIG_IS_ENABLED(OF_LIVE));
if (ret) {
debug("dm_init() failed: %d\n", ret);
return ret;
}
if (!CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
ret = dm_scan(pre_reloc_only);
if (ret) {
log_debug("dm_scan() failed: %d\n", ret);
return ret;
}
}
return 0;
}
#ifdef CONFIG_ACPIGEN
static int root_acpi_get_name(const struct udevice *dev, char *out_name)
{
return acpi_copy_name(out_name, "\\_SB");
}
struct acpi_ops root_acpi_ops = {
.get_name = root_acpi_get_name,
};
#endif
/* This is the root driver - all drivers are children of this */
U_BOOT_DRIVER(root_driver) = {
.name = "root_driver",
.id = UCLASS_ROOT,
ACPI_OPS_PTR(&root_acpi_ops)
};
/* This is the root uclass */
UCLASS_DRIVER(root) = {
.name = "root",
.id = UCLASS_ROOT,
};