ext lib: add libfdt to enable flattened device tree support

this patch adds libfdt, a library necessary for supporting
flattened device tree support in current and future versions of
the linux/android kernel for ARM.

1 files changed, 97 insertions, 0 deletions

diff --git a/ext/libfdt/fdt_wip.c b/ext/libfdt/fdt_wip.c
new file mode 100644
index 000000000..19d210e1d
--- /dev/null
+++ b/ext/libfdt/fdt_wip.c
@@ -0,0 +1,97 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *     1. Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *     2. Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_env.h"
+#include "libfdt_internal.h"
+
+int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
+                        const void *val, int len)
+{
+        void *propval;
+        int proplen;
+
+        propval = fdt_getprop_w(fdt, nodeoffset, name, &proplen);
+        if (! propval)
+                return proplen;
+
+        if (proplen != len)
+                return -FDT_ERR_NOSPACE;
+
+        memcpy(propval, val, len);
+        return 0;
+}
+
+static void _fdt_nop_region(void *start, int len)
+{
+        fdt32_t *p;
+
+        for (p = start; (char *)p < ((char *)start + len); p++)
+                *p = cpu_to_fdt32(FDT_NOP);
+}
+
+int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
+{
+        struct fdt_property *prop;
+        int len;
+
+        prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
+        if (! prop)
+                return len;
+
+        _fdt_nop_region(prop, len + sizeof(*prop));
+
+        return 0;
+}
+
+int _fdt_node_end_offset(void *fdt, int offset)
+{
+        int depth = 0;
+
+        while ((offset >= 0) && (depth >= 0))
+                offset = fdt_next_node(fdt, offset, &depth);
+
+        return offset;
+}
+
+int fdt_nop_node(void *fdt, int nodeoffset)
+{
+        int endoffset;
+
+        endoffset = _fdt_node_end_offset(fdt, nodeoffset);
+        if (endoffset < 0)
+                return endoffset;
+
+        _fdt_nop_region(fdt_offset_ptr_w(fdt, nodeoffset, 0),
+                        endoffset - nodeoffset);
+        return 0;
+}