GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/drivers/core/root.c

@@ -0,0 +1,403 @@
+// 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;
+
+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;
+	}
+}
+
+#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());
+	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_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) {
+		/* "chosen" node isn't a device itself but may contain some: */
+		if (!strcmp(np->name, "chosen")) {
+			pr_debug("parsing subnodes of \"chosen\"\n");
+
+			err = dm_scan_fdt_live(parent, np, pre_reloc_only);
+			if (err && !ret)
+				ret = err;
+			continue;
+		}
+
+		if (!of_device_is_available(np)) {
+			pr_debug("   - ignoring disabled device\n");
+			continue;
+		}
+		err = lists_bind_fdt(parent, np_to_ofnode(np), NULL,
+				     pre_reloc_only);
+		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)) {
+		const char *node_name = fdt_get_name(blob, offset, NULL);
+
+		/*
+		 * The "chosen" and "firmware" nodes aren't devices
+		 * themselves but may contain some:
+		 */
+		if (!strcmp(node_name, "chosen") ||
+		    !strcmp(node_name, "firmware")) {
+			pr_debug("parsing subnodes of \"%s\"\n", node_name);
+
+			err = dm_scan_fdt_node(parent, blob, offset,
+					       pre_reloc_only);
+			if (err && !ret)
+				ret = err;
+			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,
+				     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)
+{
+	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);
+}
+
+static int dm_scan_fdt_ofnode_path(const char *path, bool pre_reloc_only)
+{
+	ofnode node;
+
+	node = ofnode_path(path);
+	if (!ofnode_valid(node))
+		return 0;
+
+#if CONFIG_IS_ENABLED(OF_LIVE)
+	if (of_live_active())
+		return dm_scan_fdt_live(gd->dm_root, node.np, pre_reloc_only);
+#endif
+	return dm_scan_fdt_node(gd->dm_root, gd->fdt_blob, node.of_offset,
+				pre_reloc_only);
+}
+
+int dm_extended_scan_fdt(const void *blob, bool pre_reloc_only)
+{
+	int ret;
+
+	ret = dm_scan_fdt(blob, pre_reloc_only);
+	if (ret) {
+		debug("dm_scan_fdt() failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = dm_scan_fdt_ofnode_path("/clocks", pre_reloc_only);
+	if (ret) {
+		debug("scan for /clocks failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = dm_scan_fdt_ofnode_path("/firmware", pre_reloc_only);
+	if (ret)
+		debug("scan for /firmware failed: %d\n", ret);
+
+	return ret;
+}
+#endif
+
+__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,
+};
+
+/* This is the root uclass */
+UCLASS_DRIVER(root) = {
+	.name	= "root",
+	.id	= UCLASS_ROOT,
+};