[POWERPC] Add device tree utility functions to zImage

This patch adds a library of useful device tree manipulation functions
to the zImage library, for use by platform code.  These functions are
based on the hooks already in dt_ops, so they're not dependent on a
particular device tree implementation.  This patch also slightly
streamlines the code in main.c using these new functions.

This is a consolidation of my work in this area with Scott Wood's
patches to a very similar end.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/boot/devtree.c

@@ -0,0 +1,111 @@
+/*
+ * devtree.c - convenience functions for device tree manipulation
+ * Copyright 2007 David Gibson, IBM Corporation.
+ * Copyright (c) 2007 Freescale Semiconductor, Inc.
+ *
+ * Authors: David Gibson <david@gibson.dropbear.id.au>
+ *	    Scott Wood <scottwood@freescale.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <stdarg.h>
+#include <stddef.h>
+#include "types.h"
+#include "string.h"
+#include "stdio.h"
+#include "ops.h"
+
+void dt_fixup_memory(u64 start, u64 size)
+{
+	void *root, *memory;
+	int naddr, nsize, i;
+	u32 memreg[4];
+
+	root = finddevice("/");
+	if (getprop(root, "#address-cells", &naddr, sizeof(naddr)) < 0)
+		naddr = 2;
+	if (naddr < 1 || naddr > 2)
+		fatal("Can't cope with #address-cells == %d in /\n\r", naddr);
+
+	if (getprop(root, "#size-cells", &nsize, sizeof(nsize)) < 0)
+		nsize = 1;
+	if (nsize < 1 || nsize > 2)
+		fatal("Can't cope with #size-cells == %d in /\n\r", nsize);
+
+	i = 0;
+	if (naddr == 2)
+		memreg[i++] = start >> 32;
+	memreg[i++] = start & 0xffffffff;
+	if (nsize == 2)
+		memreg[i++] = size >> 32;
+	memreg[i++] = size & 0xffffffff;
+
+	memory = finddevice("/memory");
+	if (! memory) {
+		memory = create_node(NULL, "memory");
+		setprop_str(memory, "device_type", "memory");
+	}
+
+	printf("Memory <- <0x%x", memreg[0]);
+	for (i = 1; i < (naddr + nsize); i++)
+		printf(" 0x%x", memreg[i]);
+	printf("> (%ldMB)\n\r", (unsigned long)(size >> 20));
+
+	setprop(memory, "reg", memreg, (naddr + nsize)*sizeof(u32));
+}
+
+#define MHZ(x)	((x + 500000) / 1000000)
+
+void dt_fixup_cpu_clocks(u32 cpu, u32 tb, u32 bus)
+{
+	void *devp = NULL;
+
+	printf("CPU clock-frequency <- 0x%x (%dMHz)\n\r", cpu, MHZ(cpu));
+	printf("CPU timebase-frequency <- 0x%x (%dMHz)\n\r", tb, MHZ(tb));
+	if (bus > 0)
+		printf("CPU bus-frequency <- 0x%x (%dMHz)\n\r", bus, MHZ(bus));
+
+	while ((devp = find_node_by_devtype(devp, "cpu"))) {
+		setprop_val(devp, "clock-frequency", cpu);
+		setprop_val(devp, "timebase-frequency", tb);
+		if (bus > 0)
+			setprop_val(devp, "bus-frequency", bus);
+	}
+}
+
+void dt_fixup_clock(const char *path, u32 freq)
+{
+	void *devp = finddevice(path);
+
+	if (devp) {
+		printf("%s: clock-frequency <- %x (%dMHz)\n\r", path, freq, MHZ(freq));
+		setprop_val(devp, "clock-frequency", freq);
+	}
+}
+
+void __dt_fixup_mac_addresses(u32 startindex, ...)
+{
+	va_list ap;
+	u32 index = startindex;
+	void *devp;
+	const u8 *addr;
+
+	va_start(ap, startindex);
+	while ((addr = va_arg(ap, const u8 *))) {
+		devp = find_node_by_prop_value(NULL, "linux,network-index",
+					       (void*)&index, sizeof(index));
+
+		printf("ENET%d: local-mac-address <-"
+		       " %02x:%02x:%02x:%02x:%02x:%02x\n\r", index,
+		       addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
+
+		if (devp)
+			setprop(devp, "local-mac-address", addr, 6);
+
+		index++;
+	}
+	va_end(ap);
+}