[PATCH 04/16] add support for resource lists

[Sascha Hauer]

Linux has support for resource_lists. These are for collecting resources
along with a translation offset on a list. Copy it over to barebox for
use in our pci support.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 common/resource.c            | 16 +++++++
 include/linux/resource_ext.h | 81 ++++++++++++++++++++++++++++++++++++
 2 files changed, 97 insertions(+)
 create mode 100644 include/linux/resource_ext.h

diff --git a/common/resource.c b/common/resource.c
index 8678609229..76f19de494 100644
--- a/common/resource.c
+++ b/common/resource.c
@@ -10,6 +10,7 @@
 #include <init.h>
 #include <linux/ioport.h>
 #include <linux/err.h>
+#include <linux/resource_ext.h>
 #include <asm/io.h>
 
 static int init_resource(struct resource *res, const char *name)
@@ -164,3 +165,18 @@ struct resource *request_ioport_region(const char *name,
 
 	return res;
 }
+
+struct resource_entry *resource_list_create_entry(struct resource *res,
+						  size_t extra_size)
+{
+	struct resource_entry *entry;
+
+	entry = kzalloc(sizeof(*entry) + extra_size, GFP_KERNEL);
+	if (entry) {
+		INIT_LIST_HEAD(&entry->node);
+		entry->res = res ? res : &entry->__res;
+	}
+
+	return entry;
+}
+EXPORT_SYMBOL(resource_list_create_entry);
diff --git a/include/linux/resource_ext.h b/include/linux/resource_ext.h
new file mode 100644
index 0000000000..ff0339df56
--- /dev/null
+++ b/include/linux/resource_ext.h
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2015, Intel Corporation
+ * Author: Jiang Liu <jiang.liu at linux.intel.com>
+ */
+#ifndef _LINUX_RESOURCE_EXT_H
+#define _LINUX_RESOURCE_EXT_H
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+
+/* Represent resource window for bridge devices */
+struct resource_win {
+	struct resource res;		/* In master (CPU) address space */
+	resource_size_t offset;		/* Translation offset for bridge */
+};
+
+/*
+ * Common resource list management data structure and interfaces to support
+ * ACPI, PNP and PCI host bridge etc.
+ */
+struct resource_entry {
+	struct list_head	node;
+	struct resource		*res;	/* In master (CPU) address space */
+	resource_size_t		offset;	/* Translation offset for bridge */
+	struct resource		__res;	/* Default storage for res */
+};
+
+extern struct resource_entry *
+resource_list_create_entry(struct resource *res, size_t extra_size);
+extern void resource_list_free(struct list_head *head);
+
+static inline void resource_list_add(struct resource_entry *entry,
+				     struct list_head *head)
+{
+	list_add(&entry->node, head);
+}
+
+static inline void resource_list_add_tail(struct resource_entry *entry,
+					  struct list_head *head)
+{
+	list_add_tail(&entry->node, head);
+}
+
+static inline void resource_list_del(struct resource_entry *entry)
+{
+	list_del(&entry->node);
+}
+
+static inline void resource_list_free_entry(struct resource_entry *entry)
+{
+	kfree(entry);
+}
+
+static inline void
+resource_list_destroy_entry(struct resource_entry *entry)
+{
+	resource_list_del(entry);
+	resource_list_free_entry(entry);
+}
+
+#define resource_list_for_each_entry(entry, list)	\
+	list_for_each_entry((entry), (list), node)
+
+#define resource_list_for_each_entry_safe(entry, tmp, list)	\
+	list_for_each_entry_safe((entry), (tmp), (list), node)
+
+static inline struct resource_entry *
+resource_list_first_type(struct list_head *list, unsigned long type)
+{
+	struct resource_entry *entry;
+
+	resource_list_for_each_entry(entry, list) {
+		if (resource_type(entry->res) == type)
+			return entry;
+	}
+	return NULL;
+}
+
+#endif /* _LINUX_RESOURCE_EXT_H */
-- 
2.39.2