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https://github.com/brain-hackers/u-boot-brain
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![Simon Glass](/assets/img/avatar_default.png)
At present each device has two sequence numbers, with 'req_seq' being set up at bind time and 'seq' at probe time. The idea is that devices can 'request' a sequence number and then the conflicts are resolved when the device is probed. This makes things complicated in a few cases, since we don't really know what the sequence number will end up being. We want to honour the bind-time requests if at all possible, but in fact the only source of these at present is the devicetree aliases. Since we have the devicetree available at bind time, we may as well just use it, in the hope that the required processing will turn out to be useful later (i.e. the device actually gets used). Add a new 'sqq' member, the bind-time sequence number. It operates in parallel to the old values for now. All devices get a valid sqq value, i.e. it is never -1. Drop an #ifdef while we are here. Signed-off-by: Simon Glass <sjg@chromium.org>
357 lines
7.7 KiB
C
357 lines
7.7 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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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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((ulong)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->of_to_plat)
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entry->of_to_plat += 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->plat)
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entry->plat += gd->reloc_off;
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}
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}
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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 (IS_ENABLED(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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}
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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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DM_ROOT_NON_CONST->node = ofnode_root();
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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_plat(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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struct driver_rt *dyn;
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int n_ents;
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n_ents = ll_entry_count(struct driver_info, driver_info);
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dyn = calloc(n_ents, sizeof(struct driver_rt));
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if (!dyn)
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return -ENOMEM;
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gd_set_dm_driver_rt(dyn);
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}
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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_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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* @node: 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, ofnode parent_node,
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bool pre_reloc_only)
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{
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int ret = 0, err;
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ofnode node;
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if (!ofnode_valid(parent_node))
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return 0;
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for (node = ofnode_first_subnode(parent_node);
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ofnode_valid(node);
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node = ofnode_next_subnode(node)) {
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const char *node_name = ofnode_get_name(node);
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if (!ofnode_is_enabled(node)) {
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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, node, NULL, 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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return dm_scan_fdt_node(dev, dev_ofnode(dev),
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gd->flags & GD_FLG_RELOC ? false : true);
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}
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int dm_scan_fdt(bool pre_reloc_only)
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{
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return dm_scan_fdt_node(gd->dm_root, ofnode_root(), pre_reloc_only);
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}
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static int dm_scan_fdt_ofnode_path(const char *path, 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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return dm_scan_fdt_node(gd->dm_root, node, pre_reloc_only);
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}
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int dm_extended_scan(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(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(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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ret = dm_init(CONFIG_IS_ENABLED(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_plat(pre_reloc_only);
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if (ret) {
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debug("dm_scan_plat() failed: %d\n", ret);
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goto fail;
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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(pre_reloc_only);
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if (ret) {
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debug("dm_extended_scan() failed: %d\n", ret);
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goto fail;
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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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goto fail;
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return 0;
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fail:
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return ret;
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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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