[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>
diff --git a/arch/powerpc/boot/devtree.c b/arch/powerpc/boot/devtree.c
new file mode 100644
index 0000000..708cade
--- /dev/null
+++ b/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);
+}