1 files changed, 307 insertions, 0 deletions
diff --git a/arch/powerpc/boot/devtree.c b/arch/powerpc/boot/devtree.c
new file mode 100644
index 000000000000..c9951550ed2c
--- /dev/null
+++ b/arch/powerpc/boot/devtree.c
@@ -0,0 +1,307 @@
+/*
+ * 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);
+}
+
+#define MAX_ADDR_CELLS 4
+#define MAX_RANGES 8
+
+static void get_reg_format(void *node, u32 *naddr, u32 *nsize)
+{
+	if (getprop(node, "#address-cells", naddr, 4) != 4)
+		*naddr = 2;
+	if (getprop(node, "#size-cells", nsize, 4) != 4)
+		*nsize = 1;
+}
+
+static void copy_val(u32 *dest, u32 *src, int naddr)
+{
+	int pad = MAX_ADDR_CELLS - naddr;
+
+	memset(dest, 0, pad * 4);
+	memcpy(dest + pad, src, naddr * 4);
+}
+
+static int sub_reg(u32 *reg, u32 *sub)
+{
+	int i, borrow = 0;
+
+	for (i = MAX_ADDR_CELLS - 1; i >= 0; i--) {
+		int prev_borrow = borrow;
+		borrow = reg[i] < sub[i] + prev_borrow;
+		reg[i] -= sub[i] + prev_borrow;
+	}
+
+	return !borrow;
+}
+
+static int add_reg(u32 *reg, u32 *add, int naddr)
+{
+	int i, carry = 0;
+
+	for (i = MAX_ADDR_CELLS - 1; i >= MAX_ADDR_CELLS - naddr; i--) {
+		u64 tmp = (u64)reg[i] + add[i] + carry;
+		carry = tmp >> 32;
+		reg[i] = (u32)tmp;
+	}
+
+	return !carry;
+}
+
+/* It is assumed that if the first byte of reg fits in a
+ * range, then the whole reg block fits.
+ */
+static int compare_reg(u32 *reg, u32 *range, u32 *rangesize)
+{
+	int i;
+	u32 end;
+
+	for (i = 0; i < MAX_ADDR_CELLS; i++) {
+		if (reg[i] < range[i])
+			return 0;
+		if (reg[i] > range[i])
+			break;
+	}
+
+	for (i = 0; i < MAX_ADDR_CELLS; i++) {
+		end = range[i] + rangesize[i];
+
+		if (reg[i] < end)
+			break;
+		if (reg[i] > end)
+			return 0;
+	}
+
+	return reg[i] != end;
+}
+
+/* reg must be MAX_ADDR_CELLS */
+static int find_range(u32 *reg, u32 *ranges, int nregaddr,
+                      int naddr, int nsize, int buflen)
+{
+	int nrange = nregaddr + naddr + nsize;
+	int i;
+
+	for (i = 0; i + nrange <= buflen; i += nrange) {
+		u32 range_addr[MAX_ADDR_CELLS];
+		u32 range_size[MAX_ADDR_CELLS];
+
+		copy_val(range_addr, ranges + i, naddr);
+		copy_val(range_size, ranges + i + nregaddr + naddr, nsize);
+
+		if (compare_reg(reg, range_addr, range_size))
+			return i;
+	}
+
+	return -1;
+}
+
+/* Currently only generic buses without special encodings are supported.
+ * In particular, PCI is not supported.  Also, only the beginning of the
+ * reg block is tracked; size is ignored except in ranges.
+ */
+static u32 dt_xlate_buf[MAX_ADDR_CELLS * MAX_RANGES * 3];
+
+static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
+		unsigned long *size)
+{
+	u32 last_addr[MAX_ADDR_CELLS];
+	u32 this_addr[MAX_ADDR_CELLS];
+	void *parent;
+	u64 ret_addr, ret_size;
+	u32 naddr, nsize, prev_naddr;
+	int buflen, offset;
+
+	parent = get_parent(node);
+	if (!parent)
+		return 0;
+
+	get_reg_format(parent, &naddr, &nsize);
+
+	if (nsize > 2)
+		return 0;
+
+	offset = (naddr + nsize) * res;
+
+	if (reglen < offset + naddr + nsize ||
+	    sizeof(dt_xlate_buf) < offset + naddr + nsize)
+		return 0;
+
+	copy_val(last_addr, dt_xlate_buf + offset, naddr);
+
+	ret_size = dt_xlate_buf[offset + naddr];
+	if (nsize == 2) {
+		ret_size <<= 32;
+		ret_size |= dt_xlate_buf[offset + naddr + 1];
+	}
+
+	while ((node = get_parent(node))) {
+		prev_naddr = naddr;
+
+		get_reg_format(node, &naddr, &nsize);
+
+		buflen = getprop(node, "ranges", dt_xlate_buf,
+				sizeof(dt_xlate_buf));
+		if (buflen < 0)
+			continue;
+		if (buflen > sizeof(dt_xlate_buf))
+			return 0;
+
+		offset = find_range(last_addr, dt_xlate_buf, prev_naddr,
+		                    naddr, nsize, buflen / 4);
+
+		if (offset < 0)
+			return 0;
+
+		copy_val(this_addr, dt_xlate_buf + offset, prev_naddr);
+
+		if (!sub_reg(last_addr, this_addr))
+			return 0;
+
+		copy_val(this_addr, dt_xlate_buf + offset + prev_naddr, naddr);
+
+		if (!add_reg(last_addr, this_addr, naddr))
+			return 0;
+	}
+
+	if (naddr > 2)
+		return 0;
+
+	ret_addr = ((u64)last_addr[2] << 32) | last_addr[3];
+
+	if (sizeof(void *) == 4 &&
+	    (ret_addr >= 0x100000000ULL || ret_size > 0x100000000ULL ||
+	     ret_addr + ret_size > 0x100000000ULL))
+		return 0;
+
+	*addr = ret_addr;
+	if (size)
+		*size = ret_size;
+
+	return 1;
+}
+
+int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size)
+{
+	int reglen;
+
+	reglen = getprop(node, "reg", dt_xlate_buf, sizeof(dt_xlate_buf)) / 4;
+	return dt_xlate(node, res, reglen, addr, size);
+}
+
+int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr)
+{
+
+	if (buflen > sizeof(dt_xlate_buf))
+		return 0;
+
+	memcpy(dt_xlate_buf, buf, buflen);
+	return dt_xlate(node, 0, buflen / 4, xlated_addr, NULL);
+}