fdt: humble beginnings of Flattened Device Tree

This isn't really a bus_manager yet, but just minimal support so we can get rid of hardcoded ARM SoC support from the core kernel code. Needs lots of work, like proper handling of #address-cells and the like. Also, generic attribute handling, device_manager integration, and I could go on for hours ;)
2014-10-31 11:14:05 +01:00
parent c83fab8587
commit 778611c7e6
4 changed files with 278 additions and 0 deletions
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2014, Ithamar R. Adema <[email protected]>
+ * All rights reserved. Distributed under the terms of the MIT License.
+ */
+
+#ifndef _DRIVERS_BUS_FDT_H
+#define _DRIVERS_BUS_FDT_H
+
+#include <bus_manager.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef int fdt_device_node;
+
+struct fdt_device_info {
+	const char *compatible;
+	status_t (*init)(struct fdt_module_info *fdt, fdt_device_node node, void *cookie);
+};
+
+struct fdt_module_info {
+	bus_manager_info binfo;
+
+	// basic call for triggering callbacks for supported devices
+	// scans the whole FDT tree once and calls the info.init function
+	// when a matching device is found.
+	status_t (*setup_devices)(struct fdt_device_info *info, int count, void *cookie);
+
+	// map physical "reg" range "index" of node "node", and return the virtual address in '*_address'
+	// and return the area ID or error if not able to.
+	area_id (*map_reg_range)(fdt_device_node node, int index, void **_address);
+
+	// return entry "index" out of "interrupts" property for node "node", or a negative error code on failure.
+	int (*get_interrupt)(fdt_device_node node, int index);
+};
+
+#define B_FDT_MODULE_NAME	"bus_managers/fdt/v1"
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // _DRIVERS_BUS_FDT_H