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https://github.com/brain-hackers/u-boot-brain
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![Simon Glass](/assets/img/avatar_default.png)
This always has a fixed ACPI name so add it as a driver function. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
404 lines
8.9 KiB
C
404 lines
8.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2013 Google, Inc
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*
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* (C) Copyright 2012
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* Pavel Herrmann <morpheus.ibis@gmail.com>
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*/
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#include <common.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <log.h>
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#include <malloc.h>
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#include <linux/libfdt.h>
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#include <dm/acpi.h>
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#include <dm/device.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <dm/of.h>
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#include <dm/of_access.h>
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#include <dm/platdata.h>
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#include <dm/read.h>
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#include <dm/root.h>
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#include <dm/uclass.h>
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#include <dm/util.h>
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#include <linux/list.h>
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DECLARE_GLOBAL_DATA_PTR;
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static struct driver_info root_info = {
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.name = "root_driver",
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};
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struct udevice *dm_root(void)
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{
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if (!gd->dm_root) {
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dm_warn("Virtual root driver does not exist!\n");
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return NULL;
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}
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return gd->dm_root;
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}
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void dm_fixup_for_gd_move(struct global_data *new_gd)
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{
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/* The sentinel node has moved, so update things that point to it */
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if (gd->dm_root) {
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new_gd->uclass_root.next->prev = &new_gd->uclass_root;
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new_gd->uclass_root.prev->next = &new_gd->uclass_root;
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}
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}
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#if defined(CONFIG_NEEDS_MANUAL_RELOC)
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void fix_drivers(void)
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{
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struct driver *drv =
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ll_entry_start(struct driver, driver);
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const int n_ents = ll_entry_count(struct driver, driver);
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struct driver *entry;
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for (entry = drv; entry != drv + n_ents; entry++) {
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if (entry->of_match)
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entry->of_match = (const struct udevice_id *)
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((u32)entry->of_match + gd->reloc_off);
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if (entry->bind)
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entry->bind += gd->reloc_off;
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if (entry->probe)
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entry->probe += gd->reloc_off;
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if (entry->remove)
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entry->remove += gd->reloc_off;
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if (entry->unbind)
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entry->unbind += gd->reloc_off;
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if (entry->ofdata_to_platdata)
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entry->ofdata_to_platdata += gd->reloc_off;
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if (entry->child_post_bind)
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entry->child_post_bind += gd->reloc_off;
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if (entry->child_pre_probe)
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entry->child_pre_probe += gd->reloc_off;
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if (entry->child_post_remove)
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entry->child_post_remove += gd->reloc_off;
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/* OPS are fixed in every uclass post_probe function */
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if (entry->ops)
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entry->ops += gd->reloc_off;
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}
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}
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void fix_uclass(void)
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{
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struct uclass_driver *uclass =
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ll_entry_start(struct uclass_driver, uclass);
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const int n_ents = ll_entry_count(struct uclass_driver, uclass);
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struct uclass_driver *entry;
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for (entry = uclass; entry != uclass + n_ents; entry++) {
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if (entry->post_bind)
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entry->post_bind += gd->reloc_off;
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if (entry->pre_unbind)
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entry->pre_unbind += gd->reloc_off;
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if (entry->pre_probe)
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entry->pre_probe += gd->reloc_off;
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if (entry->post_probe)
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entry->post_probe += gd->reloc_off;
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if (entry->pre_remove)
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entry->pre_remove += gd->reloc_off;
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if (entry->child_post_bind)
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entry->child_post_bind += gd->reloc_off;
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if (entry->child_pre_probe)
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entry->child_pre_probe += gd->reloc_off;
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if (entry->init)
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entry->init += gd->reloc_off;
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if (entry->destroy)
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entry->destroy += gd->reloc_off;
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/* FIXME maybe also need to fix these ops */
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if (entry->ops)
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entry->ops += gd->reloc_off;
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}
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}
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void fix_devices(void)
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{
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struct driver_info *dev =
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ll_entry_start(struct driver_info, driver_info);
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const int n_ents = ll_entry_count(struct driver_info, driver_info);
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struct driver_info *entry;
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for (entry = dev; entry != dev + n_ents; entry++) {
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if (entry->platdata)
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entry->platdata += gd->reloc_off;
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}
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}
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#endif
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int dm_init(bool of_live)
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{
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int ret;
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if (gd->dm_root) {
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dm_warn("Virtual root driver already exists!\n");
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return -EINVAL;
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}
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INIT_LIST_HEAD(&DM_UCLASS_ROOT_NON_CONST);
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#if defined(CONFIG_NEEDS_MANUAL_RELOC)
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fix_drivers();
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fix_uclass();
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fix_devices();
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#endif
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ret = device_bind_by_name(NULL, false, &root_info, &DM_ROOT_NON_CONST);
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if (ret)
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return ret;
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#if CONFIG_IS_ENABLED(OF_CONTROL)
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# if CONFIG_IS_ENABLED(OF_LIVE)
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if (of_live)
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DM_ROOT_NON_CONST->node = np_to_ofnode(gd->of_root);
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else
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#endif
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DM_ROOT_NON_CONST->node = offset_to_ofnode(0);
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#endif
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ret = device_probe(DM_ROOT_NON_CONST);
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if (ret)
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return ret;
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return 0;
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}
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int dm_uninit(void)
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{
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device_remove(dm_root(), DM_REMOVE_NORMAL);
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device_unbind(dm_root());
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gd->dm_root = NULL;
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return 0;
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}
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#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
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int dm_remove_devices_flags(uint flags)
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{
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device_remove(dm_root(), flags);
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return 0;
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}
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#endif
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int dm_scan_platdata(bool pre_reloc_only)
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{
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int ret;
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ret = lists_bind_drivers(DM_ROOT_NON_CONST, pre_reloc_only);
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if (ret == -ENOENT) {
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dm_warn("Some drivers were not found\n");
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ret = 0;
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}
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return ret;
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}
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#if CONFIG_IS_ENABLED(OF_LIVE)
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static int dm_scan_fdt_live(struct udevice *parent,
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const struct device_node *node_parent,
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bool pre_reloc_only)
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{
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struct device_node *np;
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int ret = 0, err;
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for (np = node_parent->child; np; np = np->sibling) {
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if (!of_device_is_available(np)) {
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pr_debug(" - ignoring disabled device\n");
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continue;
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}
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err = lists_bind_fdt(parent, np_to_ofnode(np), NULL,
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pre_reloc_only);
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if (err && !ret) {
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ret = err;
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debug("%s: ret=%d\n", np->name, ret);
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}
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}
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if (ret)
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dm_warn("Some drivers failed to bind\n");
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return ret;
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}
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#endif /* CONFIG_IS_ENABLED(OF_LIVE) */
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#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
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/**
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* dm_scan_fdt_node() - Scan the device tree and bind drivers for a node
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*
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* This scans the subnodes of a device tree node and and creates a driver
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* for each one.
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*
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* @parent: Parent device for the devices that will be created
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* @blob: Pointer to device tree blob
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* @offset: Offset of node to scan
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* @pre_reloc_only: If true, bind only drivers with the DM_FLAG_PRE_RELOC
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* flag. If false bind all drivers.
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* @return 0 if OK, -ve on error
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*/
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static int dm_scan_fdt_node(struct udevice *parent, const void *blob,
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int offset, bool pre_reloc_only)
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{
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int ret = 0, err;
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for (offset = fdt_first_subnode(blob, offset);
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offset > 0;
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offset = fdt_next_subnode(blob, offset)) {
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const char *node_name = fdt_get_name(blob, offset, NULL);
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if (!fdtdec_get_is_enabled(blob, offset)) {
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pr_debug(" - ignoring disabled device\n");
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continue;
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}
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err = lists_bind_fdt(parent, offset_to_ofnode(offset), NULL,
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pre_reloc_only);
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if (err && !ret) {
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ret = err;
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debug("%s: ret=%d\n", node_name, ret);
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}
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}
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if (ret)
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dm_warn("Some drivers failed to bind\n");
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return ret;
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}
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int dm_scan_fdt_dev(struct udevice *dev)
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{
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if (!dev_of_valid(dev))
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return 0;
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#if CONFIG_IS_ENABLED(OF_LIVE)
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if (of_live_active())
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return dm_scan_fdt_live(dev, dev_np(dev),
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gd->flags & GD_FLG_RELOC ? false : true);
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else
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#endif
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return dm_scan_fdt_node(dev, gd->fdt_blob, dev_of_offset(dev),
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gd->flags & GD_FLG_RELOC ? false : true);
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}
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int dm_scan_fdt(const void *blob, bool pre_reloc_only)
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{
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#if CONFIG_IS_ENABLED(OF_LIVE)
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if (of_live_active())
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return dm_scan_fdt_live(gd->dm_root, gd->of_root,
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pre_reloc_only);
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else
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#endif
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return dm_scan_fdt_node(gd->dm_root, blob, 0, pre_reloc_only);
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}
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static int dm_scan_fdt_ofnode_path(const void *blob, const char *path,
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bool pre_reloc_only)
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{
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ofnode node;
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node = ofnode_path(path);
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if (!ofnode_valid(node))
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return 0;
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#if CONFIG_IS_ENABLED(OF_LIVE)
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if (of_live_active())
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return dm_scan_fdt_live(gd->dm_root, node.np, pre_reloc_only);
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#endif
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return dm_scan_fdt_node(gd->dm_root, blob, node.of_offset,
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pre_reloc_only);
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}
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int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only)
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{
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int ret, i;
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const char * const nodes[] = {
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"/chosen",
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"/clocks",
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"/firmware"
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};
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ret = dm_scan_fdt(blob, pre_reloc_only);
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if (ret) {
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debug("dm_scan_fdt() failed: %d\n", ret);
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return ret;
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}
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/* Some nodes aren't devices themselves but may contain some */
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for (i = 0; i < ARRAY_SIZE(nodes); i++) {
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ret = dm_scan_fdt_ofnode_path(blob, nodes[i], pre_reloc_only);
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if (ret) {
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debug("dm_scan_fdt() scan for %s failed: %d\n",
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nodes[i], ret);
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return ret;
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}
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}
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return ret;
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}
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#endif
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__weak int dm_scan_other(bool pre_reloc_only)
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{
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return 0;
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}
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int dm_init_and_scan(bool pre_reloc_only)
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{
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int ret;
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#if CONFIG_IS_ENABLED(OF_PLATDATA)
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dm_populate_phandle_data();
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#endif
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ret = dm_init(IS_ENABLED(CONFIG_OF_LIVE));
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if (ret) {
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debug("dm_init() failed: %d\n", ret);
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return ret;
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}
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ret = dm_scan_platdata(pre_reloc_only);
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if (ret) {
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debug("dm_scan_platdata() failed: %d\n", ret);
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return ret;
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}
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if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
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ret = dm_extended_scan_fdt(gd->fdt_blob, pre_reloc_only);
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if (ret) {
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debug("dm_extended_scan_dt() failed: %d\n", ret);
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return ret;
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}
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}
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ret = dm_scan_other(pre_reloc_only);
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if (ret)
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return ret;
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return 0;
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}
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#ifdef CONFIG_ACPIGEN
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static int root_acpi_get_name(const struct udevice *dev, char *out_name)
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{
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return acpi_copy_name(out_name, "\\_SB");
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}
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struct acpi_ops root_acpi_ops = {
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.get_name = root_acpi_get_name,
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};
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#endif
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/* This is the root driver - all drivers are children of this */
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U_BOOT_DRIVER(root_driver) = {
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.name = "root_driver",
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.id = UCLASS_ROOT,
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ACPI_OPS_PTR(&root_acpi_ops)
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};
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/* This is the root uclass */
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UCLASS_DRIVER(root) = {
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.name = "root",
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.id = UCLASS_ROOT,
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};
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