添加rtthread相关代码

riscv/rtthread/components/drivers/ofw/libfdt/fdt_wip.c

@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ */
+#include "libfdt_env.h"
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_internal.h"
+
+int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
+                    const char *name, int namelen,
+                    uint32_t idx, const void *val,
+                    int len)
+{
+    void *propval;
+    int proplen;
+
+    propval = fdt_getprop_namelen_w(fdt, nodeoffset, name, namelen,
+                    &proplen);
+    if (!propval)
+        return proplen;
+
+    if ((unsigned)proplen < (len + idx))
+        return -FDT_ERR_NOSPACE;
+
+    memcpy((char *)propval + idx, val, len);
+    return 0;
+}
+
+int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
+            const void *val, int len)
+{
+    const void *propval;
+    int proplen;
+
+    propval = fdt_getprop(fdt, nodeoffset, name, &proplen);
+    if (!propval)
+        return proplen;
+
+    if (proplen != len)
+        return -FDT_ERR_NOSPACE;
+
+    return fdt_setprop_inplace_namelen_partial(fdt, nodeoffset, name,
+                           strlen(name), 0,
+                           val, len);
+}
+
+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;
+}