1 files changed, 450 insertions, 0 deletions
diff --git a/drivers/core/root.c b/drivers/core/root.c
new file mode 100644
index 00000000000..4bfd08f4813
--- /dev/null
+++ b/drivers/core/root.c
@@ -0,0 +1,450 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2013 Google, Inc
+ *
+ * (C) Copyright 2012
+ * Pavel Herrmann <morpheus.ibis@gmail.com>
+ */
+
+#define LOG_CATEGORY UCLASS_ROOT
+
+#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/uclass-internal.h>
+#include <dm/util.h>
+#include <linux/list.h>
+#include <linux/printk.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;
+	}
+}
+
+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 *start, *end;
+		int each_size;
+		void *base;
+		int n_ents;
+		uint size;
+
+		/* Allocate the udevice_rt table */
+		each_size = dm_udevice_size();
+		start = ll_entry_start(struct udevice, udevice);
+		end = ll_entry_end(struct udevice, udevice);
+		size = end - start;
+		n_ents = size / each_size;
+		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 (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 (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;
+	}
+
+	INIT_LIST_HEAD((struct list_head *)&gd->dmtag_list);
+
+	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_REAL)
+/**
+ * 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 = 0;
+	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, 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
+
+static int dm_probe_devices(struct udevice *dev, bool pre_reloc_only)
+{
+	ofnode node = dev_ofnode(dev);
+	struct udevice *child;
+	int ret;
+
+	if (pre_reloc_only &&
+	    (!ofnode_valid(node) || !ofnode_pre_reloc(node)) &&
+	    !(dev->driver->flags & DM_FLAG_PRE_RELOC))
+		goto probe_children;
+
+	if (dev_get_flags(dev) & DM_FLAG_PROBE_AFTER_BIND) {
+		ret = device_probe(dev);
+		if (ret)
+			return ret;
+	}
+
+probe_children:
+	list_for_each_entry(child, &dev->child_head, sibling_node)
+		dm_probe_devices(child, pre_reloc_only);
+
+	return 0;
+}
+
+/**
+ * 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_REAL)) {
+		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 dm_probe_devices(gd->dm_root, pre_reloc_only);
+}
+
+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;
+		}
+	}
+	if (CONFIG_IS_ENABLED(DM_EVENT)) {
+		ret = event_notify_null(gd->flags & GD_FLG_RELOC ?
+					EVT_DM_POST_INIT_R :
+					EVT_DM_POST_INIT_F);
+		if (ret)
+			return log_msg_ret("ev", ret);
+	}
+
+	return 0;
+}
+
+void dm_get_stats(int *device_countp, int *uclass_countp)
+{
+	*device_countp = device_get_decendent_count(gd->dm_root);
+	*uclass_countp = uclass_get_count();
+}
+
+void dev_collect_stats(struct dm_stats *stats, const struct udevice *parent)
+{
+	const struct udevice *dev;
+	int i;
+
+	stats->dev_count++;
+	stats->dev_size += sizeof(struct udevice);
+	stats->dev_name_size += strlen(parent->name) + 1;
+	for (i = 0; i < DM_TAG_ATTACH_COUNT; i++) {
+		int size = dev_get_attach_size(parent, i);
+
+		if (size ||
+		    (i == DM_TAG_DRIVER_DATA && parent->driver_data)) {
+			stats->attach_count[i]++;
+			stats->attach_size[i] += size;
+			stats->attach_count_total++;
+			stats->attach_size_total += size;
+		}
+	}
+
+	list_for_each_entry(dev, &parent->child_head, sibling_node)
+		dev_collect_stats(stats, dev);
+}
+
+void uclass_collect_stats(struct dm_stats *stats)
+{
+	struct uclass *uc;
+
+	list_for_each_entry(uc, gd->uclass_root, sibling_node) {
+		int size;
+
+		stats->uc_count++;
+		stats->uc_size += sizeof(struct uclass);
+		size = uc->uc_drv->priv_auto;
+		if (size) {
+			stats->uc_attach_count++;
+			stats->uc_attach_size += size;
+		}
+	}
+}
+
+void dm_get_mem(struct dm_stats *stats)
+{
+	memset(stats, '\0', sizeof(*stats));
+	dev_collect_stats(stats, gd->dm_root);
+	uclass_collect_stats(stats);
+	dev_tag_collect_stats(stats);
+
+	stats->total_size = stats->dev_size + stats->uc_size +
+		stats->attach_size_total + stats->uc_attach_size +
+		stats->tag_size;
+}
+
+#if CONFIG_IS_ENABLED(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,
+};